There's about 5 backs that I see as lead backs.

Taylor
Dobbins
Helaire
Moss
Akers.
I think the Rams would be kicking themselves in a year if they don't get one of them. Apparently they really like Zack Moss. He's often (and I mean really often) compared to Kareem Hunt. Not a top speed guy but powerful with good vision and balance. I think he's the perfect compliment to Henderson, although I think the guys mentioned before him are more likely to be do it all backs.