Turned out I had the wrong kind of silicone. It had latex in it.
So, I got the RIGHT kind and have glued it all back in. It's already in better shape than it was after the first gluing, so I'm not going to beat myself up [too much] [more]. Nothing but time, my pride, and the price of the wrong silicone lost so I guess in terms of learning experiences this one was not too painful. Onward and upward!