A Part, and yet Apart

[Frederick22]

snip

And again,

Bahamut wanted to kill the twins and the WoL. He has no intention to temper them. Even if he could, he didnt wanted. He was to pissed off. When he got free of Dalamud, why he desided to destroy everything instead of temper everyone? Is exacly the same thing.

No you dont need to echo to summon a primal into yourself and "become" the primal and also you would be able retain your free will. You misundertood what I said.
But even so if you pay attention to the story, even Iceheart, that she supposely has the echo, didnt get totaly unharmed. Remember that the white dragon told her that she was corrupted by the manifastetion she herself created, but not corrupted enought to realise her mistake.