I don't really understand why anybody woudl think that Michael is going to do more than Randle. There haven't been any holes.
As I've said before, I went back before this season started and watched all of last year's victory. Yes, the line opened some amazing holes, but there were times when Murray made holes appear by diving through a crease, cutting back or simply running over a lineman when there didn't appear to be any holes.
It's a symbiotic relationship. Having a running back who can create yardage on his own makes the line better, which leads to more running opportunities that gives the line more chances to open those holes that the back can exploit.
I don't like to bring up Murray anymore because he is no longer here and we need to focus on what we've got, but to understand why what we've got isn't working, we need to look at why what we had was working. There was a stretch last season before he wore down, where Murray was being constantly praised for the way he would power through tackle attempts to turn potentially no gain into a 3- to 4-yard gain on first down, which would lead to Dallas having a realistic run-pass option on second down.
What we don't have right now is a back who regularly can make something out of nothing. Randle can shoot the hole. He can occasionally twist and fight for an extra yard or two and he has the ability to bounce runs to turn them into potential good gains, but he isn't going to pinball off defenders regularly to fall forward for a few yards.
McFadden has the size to do that and delivers a pop with a head of steam, but he can't find those small creases or change paths with power. He is only as good as the play is blocked.
With Michael, I don't know. He seems to have both creative ability and power, but we just haven't seen enough of him to know if he can use both on a regular basis. That doesn't mean there won't be lost-yardage or no-gain plays, because Murray had those too, but if we can get more of those plays where a 1-yard gain is turned into 4 or a 2-yarder becomes 5, we'll see things open up for the line.