If there’s any way around it - he really shouldn’t. 2 weeks mein kitna kama lega - will be negligible in the grand scheme of things. And with this proxy bs there’s really nothing left to salvage. If BB forces his return, alag baat hain - but if he has a choice, he should simply opt out - his contract ended, he left. Baat khatam achche se. Best to leave it like that IMO.
I don't think there's a legal way out of it. Not sure though. Kavita managed to get out of it so easily. But every person is different. Maybe he wants to complete his journey because he hasn't been eliminated by audience votes yet, so to say.