Well, Since I'm NOT in your league, I'll be happy to chime in Escrow.:sunshine:
It's pretty obvious that Luke is the only one that stands much chance of playing this year and if he gets a shot could be a decent QB2...but I'm not real high on the likelihood of him playing much so i don't see him adding much this year....If he can't add anything THIS year, I don't see his prospects getting any better next year.
If D-Mac goes down you could find yourself in QB trouble because none of your other QB's are guaranteed to be playing, so if you're nervous you may need to keep Luke for security....But I wouldn't.
There's a good chance of Sanchez starting and Young is only a Kerry sack away from stepping back in.
Vick is a long shot, for sure, but long term he stands to make a helluva lot more difference to your team than McCown does.
My 2 cents.