Think this is good enough to win it all?

Imho opinion, not even close. Since it's a 8 team league it seems most teams are stacked at RB and yours isn't. D. Williams probably will be 2nd fiddle to a healthy stewart, not sure he will get another 1000yd 7TD season. C. Benson is possibly looking at a 3-5 game suspension. If you had at least grabbed on of the top tier running backs I would say you had a chance. But with your core of RBs I don't think so.