The logic would be that he is 6'1 198. How many nfl RBs were built like that. Not many. Due to leverage and duribilty concerns. None of that plays in to account here.
Playing a player out of position incurres a penalty of a few points towards that said position. Sy he is a 58/61....he will never reach that 61 positional rating playing out of position . If he were moved to RB he would gain few pounds and be a bit slower , but now have that ability to reach a 61 positional rating.
This is an opinion but all throughout the game guys are to lean or stocky. Real life advantages and disadvantages comes with these builds. That's why certain guys can only play certain postions . These are tied in to real life physiology of the body that just are not coded in this game.
But remember this has always been here....I made the playoffs in a league with RBs wrs on oline and Dbs on the defensive line. Never would this happen IRL, but it did here.
I hope one day durability and fatigue as well as speed and strength are tied to the body mass index of a player . Not just weight , cause if any exploits are happening here that it's it .
And don't forget where line play is right now. Over powered to say the least. This is a great example or what I would call the Emmitt smith effect. While this guys is no Emmitt smith he is seeing the benefit of a slew of great blockers .
Still, other factors are I bet the users he plays are not using bigger defensive sets vs the 113 with the blitz .
I will go 100 yards a game and then run 10 for 10 against a user that uses this defensive technique. This is why I suggested putting in audibles that put defenses in the sets....just to mix the game up a bit from this boring application .