Kshamenk's probably the one best suited to being returned to the wild. If he's half as resilient in the wild, as he's had to be to put up with Mundo Marino, life in the ocean would be heaven by comparison.
Kiska - I feel about the same as I do Lolita, but on her own merits. She's been taken from her family in the wild, and her adopted captive family have all died off. If she and Lolita could be brought together at Marineland Ontario, it'd be a great thing. Even while Kiska had her problems with Ikaika, they still had to have had their good days.
But on the downside, with all the negative press Marineland's been getting, I highly doubt such an arrangement will ever come to pass.