It seems like quite a stretch...
Purely speculative, but a curious thought, nonetheless.
But, for fun alone, I shall entertain this engagement.
Hologram would be an interesting idea as to why physical attacks don't work on him...but with the ability to unlock Magical potential? It seems like quite a stretch...
Since his ultimate, final form is that of the pink Nu, I still think that he has close ties to the planet as is supposed they do...The planet as well is powerful and is also linked to Magic...
The weapons and armors brought forth from the planet's powers of sky, dark, fire, and water were since sealed in the northern shrine on the Queen's orders.
I actually thought of this as it would require the least effort on less entities' effort, hence more likely, ala Occam's Razor. Perhaps it is because the fact that they have attained the highest power the planet could offer, the Nu is what appeared to them─If you are strong, I am strong. When in reality, they are fighting themselves, or a projection thereof, it is only that they become one with the earth/universe(actualized potential), the Entity perhaps, that the Nu appears and they are able to overcome their limited identities to save the planet. (Buddhist Zen appears to be a strong influence...
)
I am, however, confused as to what your quote is supporting... Edit: Nevermind, I see.