You going to do the same thing for last year, and find reasons that his performance wasn't as bad as it looked? Nah, of course you're not. Doesn't fit your narrative. I looked at BBRef, and his OPS+ in 2015 was 133. He was not only unquestionably good, but unquestionably very good. As to your point about aggregating the stats, sure I get that. But when you're unquestionably very good, and then inexplicably very bad, then isn't it at least the tiniest bit plausible that there's something else going on that "oh, no, he's just bad." Because that conclusion sounds ridiculous to me even when you add up his stats into one whole. Did you conclude that Santana was just garbage after the bad season(s) that he's had? Remember when Liriano used to switch off really good seasons with really bad seasons? Ever call him out for being terrible in unnecessarily large, bolded font? He didn't have it last year. He's showed that he's been able to have it before. Why is it so pants-on-head crazy to think that we might want to give him another chance?