I'd rank out starters like this:
Season: Porcello, Price with Wright close behind
1st half: Wright, Porcello, Price
2nd half: Porcello, Price, 3 way tie for third (Pom, Buch & ERod)
I should have been clearer with my original post. I just posted ERA and not IP, but it was meant to show that Price was not pitching like our best pitcher in the first or second half, and since Porcello was 1 or 2 in both halves, I'd call him our ace.
Plus, the whole FIP thing discredits pitchers like Porcello and helps high K pitchers like Price regardless of how many outs they are getting.
We like to use OPS to judge a player's hitting, so let's look at OPS against for 2016:
.648 Porcello (187 IP)
.653 Wright (157 IP)
.707 Price (198 IP)
(.728 starter average)
(.718 team average)
.744 ERod
.762 Pomeranz
.766 Buchholz (.809 as a starter)
starter WHIP
1.02 Porcello
1.20 Price
1.25 Wright
Porcello blows price away in these important categories.