I think jean's secondary mutation is her evolution to Phoenix. she was able to tap on the Phoenix force's power without being a host. I think her secondary mutation was triggered by the power swap. Tp went way off the scales and started manifesting the Phoenix aura
Jean was manifesting a Phoenix aura way before the power swap, it started shortly after Operation Zero Tolerance, and IIRC back during her X-factor days when she was only telekinetic her astral form manifested as a Phoenix. I have vague memories of Apocalypse debating on whether or not to unlock her full mutant power back then commenting on it being equal to the power of Phoenix when it took her form. After OZT she explained it as her taking control over her own life and not holding her powers back anymore, while showing her teammates that she can be powerful, use the Phoenix name, wear the costume and imagery and not be the actual Phoenix. Jean was already a powerful telepath with unlimited potential before the power swap and stated on panel that she had gained specialized abilities from Psylocke, like physically manifesting telepathic energy and a shadow astral form, the power however was all hers.
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