Wells is the most intriguing of the top four prospects. He weighed 235 pounds at the NFL Scouting Combine but does look like a big back on film. He runs like a smaller, quicker man with lateral agility and explosiveness, short-area burst and acceleration, all necessary attributes to thrive on Sundays.
Those clearly are positives as he transitions to the NFL, yet there is a negative hiding in plain sight. A 235-pound back must be physical. Wells does not run to his weight. His style is that of a 205-pound back.
He is not strong and powerful, and even more troublesome as I watched game after game on film, is a strong impression that he does not run hard all the time. That's an issue of mental toughness, and that cannot be taught. That should be a significant red flag for any GM believing Wells can be the focus of his team's offense.