Difficult to say IMHO. When you're getting hit right after the hand off, you can't really blame the back.
So far, in two games I'd say invite him back for camp next year and give him a shot to make the roster. My opinion could change based on play in AZ, of course, but right now that's my thought. No guarantees, just come to camp and win a roster spot.
I'd still be open to drafting RB this year, though. I wouldn't pass on a good back just because we have Christine hanging in the wings. Depending on what Marsh does (retire possibly?) we might be a bit thin next year without Michael in the mix.
If we opened next season with Lynch/Rawls/Michael at RB, I could live with it. If LYnch hangs it up, I could prob live with Rawls/Michael/good rookie prospect, too.