Ok, this is an old thread, i know. BUT
Isnt this a better explanation for the phoenix
taking evidence from all 3 movies.
1 ) Jeans powers are weak in Number 1
2 ) Her powers are uber strong in Number 2
3) What could have happened in Number 1 which triggered the power boost in number 2
Hmmmm
Well, although it is mentioned in X-Men 2 that her powers havent been the same since Liberty Island, I think its more likely NOT to be the radiation that caused her power boost.
X3 Explains that she always had those powers, that they were sealed away by prof x, cause he feared what a Kiddy running round with apocalyptic powers would do to somone who didnt hand over pocket money.
Thats why, I have determined that the power boost in X2 came NOT from the radiation, but from CEREBRO!!!
Eg - Professor X put PSYCHIC blocks in her head, to stop her accessing the powers in her subconscious, She puts on Cerebro when the prof is in a coma, and WAAAM BAMMM, She gets a big whammy, her mind not ready for the stress from cerebro, cracks, and the psychic blocks fracture.
While the Writers didnt build on this idea, i think its a better idea than the radiation one. Since X3 sorta blows the whole, "You havent been the same since Liberty Island" thing to dust.
To recap
She had super powers
Prof x Blocked her powers as a child
She was weak and pathetic
Put on Cerebro
Lots of pain, Dizzyness, head ache, and possible Diahorea
Mental blocks fractured
Alkalie Lake - Oh oh, here comes a big big wave
INSTINCT Takes over, which is somthing that tends to develop along side Evolutionary traits. And she holds the water back. (Instincts guide us in how to use our new found abilities)
Boom- Shes submerged in water, for gawd knows how long, its unclear if she swam to the surface to get dinner or what, or if she just ate raw fish from the Lake, but she went in with short hair, and came out with a good 3 months growth.
Alas, she dies in x3, after tearing Alcatraz Island to pieces.
Have a look at my music video for clips from x-2 and x-3
Look for videos on Youtube by Baaleos.