Red dot gives less plains than 1E of that place. And it gives also two mines placed on grassland as well (which are little better than those placed on plains).
Trading Stone to Alex is not very certain deal since he is not Industrious leader. However he is philosophical so if he manage to complete Pyramids, it won't take long since he completes another wonder (rushed). Perhaps GL, if we gave him Literacy. It's just a theory. And of course we should take him down immediately when he completes Pyramids, but chances are small. Besides his favourite civic is Heralditary Rule, I think.
Collosus is crap, I know. And recently I am against placing too many cities on coast, because they steal trade routes from inland cities. But Colossus produces Great Merchants which means upgrades for free. It's important in domination. Besides it's very cheap if we have chopper. And Metal Casting with Gold and Silver within our grasp should be our priority. If you disagree, forgive me. It's me addiction to founding too many religions and constructing too many wonders.
So who is playing now?
edit: improved Silk produces only more commerce, the same does cottage