I think Gallman could be a 250+, 1,000 yard rusher, and decent receiver if we gave him a line and the chance. Though, as I said in another thread, if the browns take Darnold at #1, my preference as of late would be to pick Barkley #2. The two would be a great tandem.
I also think Gallman, despite his relatively smaller size, is a tougher RB than Barkley.