MB would be just as you say relieving him......If Gurley goes down no one could replace him......relieve him yes...replace him no.....

IMO the thing that MB really brings is his blocking.....his runs are smash bang type stuff...but what the backups don't have is the blocking knowledge.

IMO that is what hurts with him out......btw....let's please refrain from any mention of something happening to TGIII.....LOL....No need for negative thoughts/mentions......