So after 2.4 ends and you defeat Shiva. You find out that Iceheart becomes a vessel of Shiva, and is thought of having the power of the Echo. Believe this is the reason Iceheart wasn't controlled.

I was wondering, would it be possible for anyone to become a vessel of a Primal, if they know how to summon one? Along with that, if the person has the power of the Echo, could they become the vessel of a Primal for a short time and still retain themselves?

This kind of works in a few ways. Now I maybe wrong, but it's just some ideas. Since I really don't see a huge benefit when you choose your Guardian during character creation. Do you think it's possible in the future they might implement like a short power boost, where you turn into one of The Twelve, based off the Guardian you choose?