I don't personally feel good about Sermon or Tracy. FBG has Tracy at like RB21. Seattle can be ran on, and they're harder to pass on. Do with that what you will. Sermon's yards per carry haven't been good, and while Flacco may open up the passing game, the threat of AR should have helped with running lanes. I just don't think Sermon is a great back, and you're probably hoping he falls into the endzone. I think that's a coin flip.
Akers I don't feel GREAT about, but I think he could be "good." Buffalo gives up the most points to RB's. Bernard is back, but they're still dealing missing some guys. Houston/Buffalo should be a shoot out. I think there's a better chance Akers falls into the endzone than the others. If I was in need, Akers is where I'm personally going for those reasons.
FBG is great though, and I certainly can't fault you for listening to their guidance on Tracy