I think there’s room for everyone at least going into camp. Runningback is one of those positions where you’ll often have injuries so there’s no need to try and over-engineer things this off-season.
With the Pats likely to lose Wes Welker their offense will go through another evolution and who knows how all these versatile running backs will come together in that new attack.
Obviously it will be one of the more interesting areas to watch next summer with so many talented guys, but I’d suspect that all have a chance to make the team. And I don’t think Slater is in any way influenced by the running back personnel.