Champion w/o A Stud RB? Possible?

I am wondering what everyone thinks about this topic. Can you win a championship without a top-tier running back? How about if you had three star receivers & average RBs? At the same time, I don’t see being able to acquire these RBs, bc my league is painfully trade averse.

I unfortunately drafted bell, and was stupid enough to trade him away early on.

I am somewhat confident that I can trade and get Bell back.

My WRs: MThomas, Kupp, CDavis, Josh Gordon, Lockett

RBs: Howard, Breida, Lindsay, Coleman, Hines