I dont trust Headley enough yet. Looks he finally had his breakout a GREAT year after he was just so well regarded for so long and disapointed. I want to see one more good year. Dickey had an insane level year as week too, but he had good stretches before and maybe I am biased since I believed in Dickey more and drafted him a few places with decent lower round picks last year (never expecting what he actually did - and yes did own Headley in 2 leagues as well). Even with the move to AL I think his power knuckle will still play and he represents better help for you to try and win right now, IMHO.
I could be 100% wrong in this prediction if Headley can repeat what he did, just today right now - I dont think he can and view Dickey as the safer option.
If you lean to headley and many other posters do, I don't think there's anything wrong with going that way.
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"I'm the man with the ball. I'm the man who can throw it faster than F***. So that's why I'm better than anyone in the world." - Kenny Powers