Fair, yes, but I don't know if I really want to deal for a banged up Felix right now until we know his prognosis. I haven't really dug into injury situations for the coming week, so consider me out of the loop there, but separated shoulder doesn't sound like a 0-1 week injury recovery to me. I am no Jackson lover, and after I see the rest of your roster (please post if/when you get a chance), I might still advise you to pull the trigger. It's just that your question, in a vacuum, causes too many questions to speak emphatically.
If you can fill us in with your roster, league scoring settings and roster requirements, I'll certainly chip in my opinion, though