In order to ignore older data you'd have to prove the stuff has changed. Chacin has never been a hard thrower, and he's always been pretty a sinker/slider guy. But if you want to try to prove it, go for it. I'll wait. Ignore history at your own peril. History is full of pitchers who had one good year and a few meh years and never do much after that. The most recent history of any kind of success after 2013 is 2017 which not coincidentally happens to be in a pitchers park. Away from there he was horrible. The odds of a 30 year old pitcher magically rediscovering his 2013 hitters park magic are remote. But as you say, ignore history if you wish, because it isn’t kind to this fellows outlook, but you knew that and are just being argumentative.