I think it's a crummy trade for Houston, great one for Philly. Velazquez is probably a back end reliever if they plop him in the pen right now. Likely not quite as good as Giles, but still solid. Fisher is a toolshed with plus raw, plus speed, and some demonstrated OBP skeez. Oberholtzer might not be great but he has 5 years of control left and was solid in 2014.
This is like Osuna + Alford + for a closer.
C'mon