Along with the release of Hill, only keeping 4 RBs is a bit of a surprise. Saw conflicting things about Tukuafu but it appears he did in fact get cut. I am wondering if we'll use a TE (Vannett) as an occasional lead blocker like the Vikings have done with Rhett Ellison. Either that or maybe Tukuafu comes back at the expense of one of 12 DBs who made the final 53.
Think the last sentence of your post is what happens.