The Cowboys have been trying Chaz Green everywhere else on the line, so they might as well give him a looksee at LG as well. Who knows, maybe that's the spot for him, when all is said and done. No harm in giving him a chance to find his niche to give his best performance.
The main concern I have with him and likely what the team has as well, is his durability or the lack thereof. I'm really hoping Chaz gets his body in tip-top shape in the days ahead if he hasn't quite done so already. That'd definitely be a good starting point, if you ask me.