I actually specifically built Dask with the intention of being the master to at least one Alluran party member.  Dask can do all sorts of fun things related to making their familiar change into various potentially-useful forms, and can cast touch-range buffs on their familiar out to a range of one mile.  Though, I do agree that it would probably be better to have the players of the two Allurans in the party pick who they'd like to be paired up with.  Aramis is likely to be a more kind and caring master, I think, while Dask is Neutral Evil. :P