Fisher is being interviewed on NFL Insiders right now. I'll copy what he says verbatim..
"As far as Tre's concerned, um, ya know, running backs have to learn how to play without the football as well as playing with the football and it often times takes running backs a few weeks or time to do that. By "that" I mean the pass protection and stuff and getting out in the routes where we can trust him. He's worked very hard over the last few weeks so were going to start increasing his carries whenever possible."
He smirked a bit after finishing that last sentence.