haha i don't think so i have EVER seen that! he often stays backwards. i'm guessing +shared faith with so many civs helped him get trading buddies?
my recent game with aggressive AI and mostly warmongers he did very well and really surprised me. it made sense tho once thought i about it. because the AIs on the map were mostly the warmongers, he started off with better invisible relations with those guys. and they all used the nonwarmongers as punching bags. i spread "the right" religion that i wanted to use to the warmongers so that they'd get along with me, and that also helped his relations with them too. i think he also benefited from tech trading a lot more than he usually would due to be friendly with more civs than in 4 normal games combined. in fact, he was friendly even with me, and gave me chemistry for economics and nationalism, when only 2 people knew chemistry. this is toku, he will
not trade techs until
everybody he knows except that person knows them unless he's friendly with the trader. combine that with open borders and tech trades themselves gaining you the +s to get to friendly, he rarely gets to friendly with folks to ever do tech trades, so he has to do his research himself or by pointy stick and that's part of why he usually stays behind.
in my game, he ended up with a pretty big chunk of land during the wars with the peaceful AIs. late game he led the AIs in score, techs, and power. in a shocking move, he actually left merc

for free market in 1613 and that was the right move for him at that time, since he had OB with so many civs with good cities that he got good trade routes. he did really really well. ummm, until after i won the game officially and decided to do my "hey how fast can i take over these specific japanese cities since i want what's in them" backstab. after that, well, he kinda sorta wasn't doing so hot.