I think Stro, Hutch and Osuna/Sanchez (hopefully Osuna) will be in the rotation and they'll have to get creative on how to limit the innings from Osuna/Sanchez. They need make a decision on Dickey and I suspect he'll be back (not that I love it). I think they have to get 2 starting pitchers which can be relied upon and then they need to re-stock AAA and/or their bullpen with 6th starter depth guys.
Personally, I don't see Colon as a fit at all. If we keep Dickey, I think we need someone who's more of a upper tier starter (Price, Shark, etc.) and Colon isn't signing here as our #6 guy. The only way he fits is if they don't pick up Dickey's option and even then, I'm not sure I consider Colon reliable at 43 and 320 lbs.