I think this could leave to staffing issues.
I am going to have to do some more research, but I just got off the phone with a friend of mine, and he thought there was not really many options to get crews from STL to MIA. This leads me to think TSA will have to DH on mainline flights. It has been my experince that they do not like to do this. I sure there are times they have to, but never had done it for me.
It just seems the way ord and IAD run with crews and the never ending time issues...one more hub that is crew base is just going to make this worse to the point of perhaps appearing understaffed. I am sure in reality it is going to be crew inefficiencies wearing the company understaffing costume.
I really have not heard where the crews are coming from, as said above it does not looke to be RIC, but that would make sense, crew base, and MX base. In the end if they decide not to use the RIC base for any of this, then it is going to get expensive shuttle airframes back and forth for MX.
Just speculation on my part thats all
Reeves