I am in similar situation, non-current from a 5 yr staff gig. I focused on TSA primarily for ease of commuting and majority in my class had similar reasoning. Two of my old SQ bubbas who settled after a Scott tour came here as well. IAD is likely out of training for who knows how long and difficult to predict but my guess would be 3-4 months after IOE to get STL (6-7 months total after hire) assuming you have max senior reservation program days. As far as studying, if you already have job offers, you can focus on Sheppard Air ATP prep, which is normally provided once you agree to a start date. TSA at one point was paying for GA time to dust the rust off but they no longer have that option, though you could try to negotiate that. Not a bad idea for some GA time, but not going to be a shortfall...reviewing your instrument procedures would be most helpful as now I dont' have much time for extra studying. In training now, if you want more specific info, you can PM.