His ERA and FIP are around 3.5. That's good, but one of the best starters in the game? Sorting by ERA, there are 29 starters with a better era. By FIP there are 20. He wouldn't even by our best starter based on those metrics, and our rotation leaves a lot to be desired. That still makes him a number 1 on many teams and a number 2 on every team. And he plays in the AL East. Our 17th best prospect got us about 20 innings of Swarzak for example. Happ will be a relatively major pick up by rental standards and the team that picks him up won’t have money on the books for 2019.