Josh Smith is literally the opposite of a stretch four. He is a historically bad 3 point shooter, yet he continues to chuck them like he can make them. Contracts aside, I would rather have Marvin than Josh Smith. He fits what we want to do, and isn't a chucker.
Take a look at his stats from last year:
26% 3P% on 3.4 shots per game. 26% is legendarily bad for someone who took 265 three pointers in a season.