So as not to hijack, I'll post this again in another thread. (Good idea, Elliot.)
Good luck coming back from your injury. Although the metcon will warm you up, don't forget that it won't warmup the movement pattern necessarily, so a lighter weight warmup set before the heavy 5x5 might be appropriate, just to make sure you're feeling in the groove with the movement.
I've been warming up my deadlift by doing snatch-grip deadlifts and find that even with that my one "heavy" DL set feels better if my last warmup set is conventional DL and not SGDL.