Stoopkid- I'm thinking you're right on the Red Rigsby. I think Rigsby saw Macallister in s1E2 and that's when he was recruited him for TT. I'm theorizing we'll see Rigsby, charismatic and gorgeous in stylish suit ....and then the English accent!
VP finds out, she kills him and then raises his child, leaving the door open for a red John jnr spinoff. Ok, maybe not that last bit I really am watching WR as a plausible suspect.
OY is a brilliant actor whose range has not been shown yet. I don't think TT is a big part of anything, just a way for RJ to purge some of his disciples and make a clean start.
Now some will say the RJ storyline is over. I think not only will PJ do a spectacular round up to answer our questions...and BH will then reveal to us how he manipulated us.