Realistic expectations?
Twins will find a place for him to work through things, either towards his old stuff, or reinventing a repoitoir if he can't do quite what he wa doing.
Given that, he won't be added back to the 40 until they are ready to use him, and pretty sure he can have success.
Personally, i think he'll be worth having by the end of the summer, even if he is still not 40 manned, but getting to be an elder statesman in the minors, much like Albers. And yeah, i wouldn't count him out. He still has unfinished business against the Yankees in the playoffs...