For the Record, here are the facts on microfracture:
http://en.wikipedia.org/wiki/Microfracture_surgery#cite_note-6Leon is looking at a lengthy recovery and probably shouldn't rush to get back next season - he should allow the rehab to dictate his recovery time or he'll risk further injury.
Once his leg is back up to 100% of its former strength he won't be in danger of a compensation injury or re-aggravating the knee - which is what he did to the first ACL he had.
I expect Leon to recover fairly quickly because he is both young and an extremely diligent worker, so he'll get the most out of his rehab.
There is definitely a spot on this roster for him as the team will likely rid themselves of 3 current players, (Moore, Pruitt, TA) and will get a fantastic deal on Leon's contract, which makes him a good investment.
Regardless, don't look for him to be back until March/April in all likelihood. Microfracture is going to extend the rehab process because they are not going to want to push the bounds of the rehab time and should opt for maximum recovery before putting him on the court.
Best guy i've ever met in pro basketball - Gomes included - be a shame if he isn't given a chance to show he can recover and contribute to this team again.