Unless his quality of life is going to severely drop I don't understand why he didn't want to go. You are a footballer, go and play football for heaven's sake. What a waste of a career hanging around when you are unlikely to play.
According to transfermarkt he has no agent. Compared to the other players in Everton who all has an agent agency as you mentioned. Of course transfermarkt can not have every small agent agency listed. But still it is a bit strange.