Just like my last post, that type RBs only work if you have a Bama/tOSU type Oline. We're quite a few years away from that.
Adrian Peterson led the NFL in rushing last year behind an oline that was garbage. A good big back can do a lot to cover for a mediocre line. Not trying to compare this kid to AP, but the argument that a quick back is needed with a lessor line does not hold water. I do believe Henry from Alabama could have matched or bettered Warren's numbers last year behind our line, given the same amount of carries, and the extra size usually equates to more durability and potential to take an even bigger load. Likewise, we have had a long list of smaller shiftier backs that continually got dropped in the backfield because they could not break tackles.
You may be right in that this kid may outgrow the position, even before he arrives on a college campus.