I didn't speak to Mr. Gilmour. Perhaps Dr. Poliquin can speak to the renewal of the lab lead.
However, I will also say this. Obviously he is entitled to a certain degree of privacy for why he chose to leave. Again, with regard to people's HR, because personal employment choices are...really, this is private information.
I suppose that's a question you could have posed to him. He would have been more appropriate to answer it.