When I first saw this deal for Happ, I thought OK, we can use a #5 starter and win a good number of games with the offence in the current lineup. Happ keeps the team in the game more often than not.
Since then, I have come to think that Happ will improve simply because of how good our team Defence is now.
Happ had a career era of 4.12 as a SP. Which is slightly better than average.
Assuming that the great team defence could save half a run each game, we could be looking at 3.60 era from Happ.
Now combine that with MLB top scoring offence, we should see a ton of wins in games he starts.
Last year Happ pitched 7 innings 7 times, and 6+ innings 11 times. He has continued to keep his team in the game.
Happ is not David Price, but he could turnout to be a 15 to 16 game winner next year.