Donald Brown is 5' 10" and 210 lbs . . .
Tevin is 6'1" and 210 lbs . . . I don't see how Tevin is any more of a "power" runner than Brown is.
Tevin's style of gaining yards works very well in a zone blocking scheme where getting the 55 yard run to compensate for 6 or 7 two-yard runs makes sense. But that's not a power running scheme. A power running scheme is one where the line and back virtually assure you 4 yards every time the back carries the ball, and 6-9 yard runs are common, but anything more than 15 yards is extremely rare. A power game is like watching RMK's teams before the shot clock . . . no flash and dash, but over time a virtual certainty to make something positive happen on every play.
I don't know whether Tevin can be that kind of back in the NFL, as there's nothing in his history at IU to suggest that he will.