You are guessing Fred. You say by "all reports," can you provide some links of where this was reported. I know why he left for. I am not going to say it here, but what you are saying is off the pace, didn't happen.
Sorry you might be right and hoping you are right but that's not what I heard, Why would an assistant coach leave a few weeks before the end of the season if he was happy at the club and the below might be right But why was he wanting to leave in the first place, and what's wrong with applying for senior jobs whilst you are an assistant coach just a get-out clause from the club to protect Bevo in my opinion
The club probably told him that they need his full attention come finals and we can't have him applying for any senior coaching roles should any become available. If that is what you think you might do it's better you leave now to avoid any unwanted distraction during finals for the club. And given the fact that Monty has ambitions to be a senior coach he has left.