Just had a look and the season before he averaged 90 he averaged 57, before that we are talking low 30s for a good few seasons. Carberry had one awful year in 2012 but apart from that he had been consistently excellent for about 5 or 6 years. Is also worth remembering that he had to recover from a serious illness,I reckon that is the biggest reason he was not in line to replace Strauss when he retired. I don't really disagree with you that in 2013 Compton had the better case, he had certainly had a better couple of years, but I don't think he is a better player.I'm pretty sure Compton had had three seasons in a row averaging 50 plus. The last of which was in the high 90s where he won player of year. Pretty sure Compton's 2013 season might have been better than Carb's at a division higher as well.
Also relevant about Compton is remember how they dropped him and then made him play that warm up game for Worcestershire (or whoever it was) making it seem the door was still open. He got runs and they never picked him for anything ever again. Bit like KP here in some ways, especially when we found out he didn't really fit in with the team environment, or something like that, later.
Also, this is way better than talking about KP.