I've seen many postdocs go from one postdoc position to another, because that's all that was available, because the postdoc had to move for the sake of his spouse, because he wanted to come back to his alma mater, because the new position paid better with fewer hours, etc.
It's not entirely unusual for a GA to take another GA position elsewhere because of any of the above reasons, especially if it's at his alma mater. I don't fault Laurinitis for taking the job at tOSU.
I'm grateful to him for his time here, and hope that he was able to pass on his wisdom to the players.