If Cain stays healthy, he's due a breakout this year, IMO.
He showed surprising power even after the leg injury that could've really robbed him of his base.
You give him 600 ABs, you could potentially have a 20/20 player on your hands. Granted, a ton would have to break right for that to happen and he'd certainly need to continue to work on his strike zone judgment, but it's not impossible.
You guys will really regret Myers in CF, IMO. You cannot cut corners on your defense up the middle. I guess you also have that banjo hitter off the bench you could run out there, but man are you really eager to give that guy 500+ ABs?
I'd still rather give up Colon. Cain could be a very valuable weapon for the Royals, both offensively and defensively.
If you can't draw a crowd, draw dicks on the wall.