Alot work on the basis arrive with the manager leave with the manager, the chances are their contract were all up as well.
Personally wouldn't be surprised if its a case of Chansiri wanting playoffs next season but expecting to do that with frees and loans, Moore has told him it's unrealistic and we should be looking at consolidation and they've decided to go their own ways.
Let's be honest the work he's done off the pitch with reconnecting the fans with the club far outweighs the work on the pitch.