I read that article. It talked a lot about the catching too. The article had a lot of interesting points. I'll try to go find it and post it here.
It talked about how much the change up was being thrown, it also shows the stats for Porcello with Hannigan catching and the others, then shows stats for Porcello throwing to the different Detroit catchers. Porcello's ERA was lower than 4 with Hannigan and a certain catcher on Detroit. His ERA with all other catchers was I think around 4.5. The main statement was about pitch calling and that making Porcello throw his strong pitches at the right time. This year he has been going with a changeup in certain situations, where veteran catchers would make him throw a sinker or something he was doing well at.
All in all, I hope Harrigan catches him next just to see what happens. There is something wrong with Porcello, maybe Pedey should sit with him on the bus and analyze his delivery..........