If I remember correctly episode 95 (season2) Shadows of the Past...
There was an Imp that made the form of Aaron...
So what I am saying is.....

There was no imps when Aphmau and the rest got away from that Island.... There was also no imps on the Island where Aphmau made her village....

So that imp must be new and maybe saw Aaron and took his form...

SO AARON MIGHT BE ALIVE!!!!!!!!!