I like Mingo too, fast indeed, only if he knew how, or could to rush the passer. Perhaps you are right, and he can make a move to ILB. I also think Simon would be a good ILB, perhaps replace Morrison. Walker is not good. Bostic played well in coverage against the Texans, surprisingly.
What about Simon and Mingo as ILBs, with Sheard and Basham as OLBs. I'm not sure how good Basham is at setting the edge though.