Kaitzilla will probably do a more indepth analysis but Pacal definitely has good odds of drawing Monty's aggression towards him first, the key being they are the only two mysticism starters so split religions is likely.
Just a quick calculation from Monty's perspective. Pacal has 0 warmonger respect so no brownie points there. Monty is -1 base relations modifier.
Best case scenario for Pacal (Monty rolls 2, Pacal rolls 0)
3 - (2-2) -1 = +2, so best case scenario for Pacal is that Monty is cautious at 0 and pleased +1 after 60 turns with no other factors.
Worst case
3 - (4-0) - 1 = -2, so cautious towards Pacal.
Since its likely they split religions, Monty almost assuredly will be annoyed with pacal by the time plotting happens, putting him at the same diplo factor as Elizabeth from Monty's perspective. Since Pacal and Monty are closer via capital distance and the food res/flood plains region is sure to be 2nd/3rd city spots for both, border tension is going to be a big factor and i'd actually say its more likely pacal/Monty come into conflict than Monty/Elizabeth first. Then when you factor that hatty is likely to go for AH because of the plains cow (big fan) in her capital and her 2nd or 3rd city likely to claim the clam/horses area, hatty could very well start early plotting vs cathy since War chariots fulfill the 2 attackers unit quota by themselves. Elizabeth has good chances of getting through the early game without aggression and her choice of dogpile, and the same goes for Freddy who seems even more insulated from aggression due to the way the diplo could work out. I'm not sure how often monty/pacal will split religions but I'm liking Elizabeth for first here if she gets the opportunity to dogpile as well as Freddy getting to be the Mehmed of this game.
Sure, I'll give the relations a look.
With 6 AI,
the 3 AI in the 4th, 5th, and 6th place on the scoreboard will secretly have
+1 "Developing Nations Should Work Together to Catch Up"
Catherine will secretly feel
-1 "We feel threatened by your large civilization" against anyone who is 4 or 5 places above her on the scoreboard.
Montezuma will secretly feel
-1 "We feel threatened by your large civilization" against anyone who is 3 or 4 or 5 places above him on the scoreboard.
Hatshepsut will secretly feel
+1 "Your small civilization is no threat to us" against anyone who is 4 or 5 places behind her on the scoreboard.
Montezuma and Catherine will secretly feel
+2 Warmonger Respect! with each other. (part of "A First Impression is a lasting one")
Montezuma and Catherine max out on border tension just like Julius Caesar.
Anyone with a long border that steals 4 of their big fat cross tiles will get -2 border tension.
Catherine and Pacal have a pairing made in heaven!
Both have a peace weight of 2, so there is a 44% chance of starting with +2 hidden diplo with each other from peace weights.
Both have +1 base relations with everyone.
Most importantly, both have a Favorite Civic of Hereditary Rule!
Pacal can get up to +6 towards Catherine and Catherine can get up to +4 with Pacal if they both run hereditary rule. It takes a while to build up though, 10 turns for each +1.
More often then not I would expect them to be Pleased with each other all game unless they get different religions, and Pacal will not plot war at Pleased.
Elizabeth and Hatshepsut have a good pairing.
Both have a peace weight of 9, so there is a 44% chance of starting with +2 hidden diplo with each other from peace weights.
Both have +1 base relations with everyone.
Hatshepsut will not plot war at Pleased, so I expect Hatty will only attack Catherine unless Hatty feels like going on a distant adventure.
Montezuma is the devil in the middle of the map.
He has -1 base relations with everyone.
Monty's highest odds is 33% chance to start the game at -7 Annoyed with Elizabeth
Monty's highest odds is 33% chance to start the game at -7 Annoyed with Hatshepsut
Monty's highest odds is 33% chance to start the game at -6 Annoyed with Frederick
Monty's highest odds is 33% chance to start the game at +0 Cautious with Pacal
Monty's highest odds is 33% chance to start the game at +2 Cautious with Catherine
Elizabeth, Hatshepsut, and Frederick should all start the game Annoyed with Monty as well.
Catherine's highest odds is 33% chance to start the game at +4 Pleased with Montezuma
Catherine's highest odds is 44% chance to start the game at +3 Pleased with Pacal.
Catherine's highest odds is 33% chance to start the game at -3 Annoyed with Elizabeth and Hatshepsut
Catherine's highest odds is 33% chance to start the game at -2 Cautious with Frederick.
It is strange to see a bad guy like Pacal have such a low aggression rating.
Elizabeth, Catherine, and Montezuma all like plotting dogpile wars a lot if their neighbor is already at war with someone else.
The religious nuts are Montezuma, Pacal, Catherine, and Hatshepsut who will have -3 vs. anyone with a different religion after 5 turns. -4 if they own the holy city.
Pacal, Catherine, and Hatshepsut can get up to +6 shared religion. +7 if they own the holy city.
Monty can get up to +3 shared religion. +4 if he owns the holy city.
Even Frederick likes religion to a degree. -2 vs. anyone with a differerent religion, and up to +5 shared religion.
Elizabeth does too? -1 for different religion.
But up to +5 Shared Religion.
She likes the Free Religion civic and won't stay religious all game.
Religion should matter a great deal in this game!