I think it is clear Plexy was just throwing the game when he went Brits. He said himself that he did not want to go far in the tournament. I think his first game showed he could be competitive as PE, hence why he should have picked them second round.
he would not have been able to pick pe in game 2 as in a BO3 he starts axis then have to play allies and in game 3 vp leader decides ( that was me ) so if he wanted pe in g3 he would have had to do better in game 2