I don't think we are desperate for a second RB, nor are we filling a spot for the sake of filling it. The staff thinks that Bryant and Folston are both quality football players who would be excellent in our offense, and when they have a shot at guys like that they want to get them in the program. If we miss on either or both, we won't go after a three-star project ... that would be "filling a spot just to fill it." The reality is we don't need anybody at RB this year, with Carlisle, McDaniel, Atkinson and Mahone all with multiple years of eligibility remaining. But at such a key position you'd like to get at least one every year and we aren't going to pass up quality football players.
I disagree that we are going after both because they are distinguishable players who will fill different roles. Bryant may be a bit more developed physically, but both are shifty RBs who show the potential to be great receivers as well as great RBs. Same with Isaac -- even though he is huge, he has a lot of shake in the open field, as you can see when you watch his tape, and he has great hands. Guys like that, guys like Theo (Bryant and Isaac are more than that -- Theo with size), are rare enough that we want to take them whenever we can get them. Such players are right behind mobile passing QBs like Everett and Kiel as THE players who make our offense work.