I think he'll come back as a Utility initially, which is perfect given the reasons you've just outlined. He should be training at Fullback though, and at Centre too, because by Round 8 there might well be vacancies in one or both of those positions.
I get Isaako has been underwhelming, but he had plenty of reasonable and legitimate personal circumstances to mitigate a lot of last season.
He came to us as a Fullback though, and became a Winger by circumstance. If we're going to judge him, then lets judge him on his work at Fullback in a proper trial and not just the Nines where he spent most of his time on the Wing again, and before we nominate his replacement, how about we actually have a look at his replacement actually play there too instead of just hypothesising that he'd be a better solution. That's all I'm asking of people.