I'm a bit skeptical about whether or not he can come close to his old level of play - or at least become a good rotational player - given that he hasn't played the last two years.
Moreover, we already have a lot of big men on this team meaning that he would take away minutes from a player like Theis if we were to sign him (and I think that Theis has done a good job so far).
But at the end of the day, I wouldn't mind cutting one of the rookies (like Nader) to make room for him. It's a classic low risk high reward type of signing.