He was actually cut last weekend, so he can probably join the club right away. I suspect that Freddy gets put on the DL immediately so no other move is needed. When Panda comes back, that sends Connor back to Fresno.
Hall has only played 2B for Houston this year, with a F% of .975. Not HORRIBLE. Last year he played the super-sub for Boston.
IF he "finds it", this could be a HUGE sign. If he doesn't, cost the Gs about 300K.