Why can primals summon egi?

[lololink]

In many cases they are giving lifes to aspects of themselves. With Garuda we see her calling forth Chirada and Suparna. For Titan, he summons forth Gaolers aspects of him watching over those he has imprisoned in his gaols. With Ramuh he calls forth Arbiters to carry out the sentencing of the judgement.

They are gods that exist as spiritual beings, so it wouldn't be a problem for them to control multiple bodies, I think that's what the arbiters and the gaolers are, as for Garuda they seems to be some kind of illusions and not Egi ( the game says something like, the mirages of Garuda appear i think )