Each Phantom and the External Artifact's relationship developed differently. Lone Blaze was looking for a strong warrior to protect her from an impending threat that ended up being the Crimson Monarch.
She made a pact with Adam and took her tasks seriously. To her, Adam was a master, and she was willing to obey all his orders and carry them out.
Obviously, there was a very different dynamic between Risha and Radiant Mirage. They were equals or even Radiant Mirage took the lead when communicating.
However, it was clear to everyone that the External Artifact depended on Phantom much more. Radiant Mirage had abandoned his inner space and soon his physical form, the star-crystal would collapse with no more meaning.
The only place he could feel at home now was Risha's inner space and especially her Initial Gene.
"Wait..." Risha muttered, barely concealing her growing joy. "I'm getting a new ability? From you? Right now?"