As for Bijan Robinson. Not a need. But he could transform the offense. Besides being a 4.46 back with WR speed that can beat corners - he has the power to run over people. He wasn't used extensively as a receiver but I didn't see any problems with him catching the ball.
I've seen all his games but last season he was held to under 3 yards per carry by 2 defenses: Alabama and TCU.
Another halfback that is kind of under the radar that I saw the last couple years is from Texas A&M (my son goes there). Devon Achane. Small but tough and incredibly fast (4.32 40). Good receiver and excellent return guy. But for a guy under 190lb he can run inside.