I actually think he will make a comeback, complete with video showing showing him prepare for his next big comp and Masters Mr O. Would attract a ton of views (not sure if any sponsor, but as we know infamy and publicity does sell).
As others have said, his receptors may well be fresh, and I suspect he as been working out in there.
If I was him, once out I would start a month of hard cardio, good diet, fresh air, UV, and relatively high reps of core muscle groups daily and also lots of daily stretching and yoga.
And then hop on the test for 3 months with a more standard bodybuilding regime with a powerlifting base, and then after that add in the GH and basic steroids, training 2x a day and publicizing the whole blow up of physique for a contest perhaps 1 year out. Its probably the most viable thing he could do to earn an income and redeem himself once released.