I'd keep one of those RBs. The whole "bird in the hand". IDK if your league is PPR, but Collins ADP is 3.10. Drake 4.04, so both have value in the 7th. Non-PPR, Collins up a little, Drake goes to 4.03 so no real change. I really like Collins, and he doesn't have much blocking him from high volume in the Ravens backfield. Drake has Gore who will likely get a lot of 1st down and goal line work. So, I'd lean Collins, but Drake in PPR is really intriguing. Either way, no picks between 5th and 8th rounds isn't a huge deal as you'll have 2 players and 6 picks (5 top 27) before that point. I assume that should be enough to fill most (if not all) of your starting lineup.