I feel like you're thinking that fip thinks Stroman is better. That's not what it's for. It's a stat that gives you expected performance for a player based on their rates of walks, homers and strikeouts.
Fip is saying that you should expect/project Stroman to do a little better and Happ to regress a bit.
WAR is the stat you'd use to judge who's better in any given year.
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