I'd rather he just assume the Red Zeo Powers for the great battle. That way there can be complete core teams;
MMPR: Red, Black, Blue, Yellow, Pink
MMAR: Red, Black, Blue Yellow, White,
Zeo: Red, Green, Blue, Yellow, Pink, Gold (Trey)
Turbo: Blue (Justin), Phantom Ranger
Space: Red, Black, Blue, Yellow, Pink, Silver
Galaxy: Red, Green, Blue, Yellow, Pink
Lightspeed: Red, Green Blue, Yellow, Pink, Titanium
Time Force: Red, Blue, Green, Yellow, Pink, Quantum
Wild Force: Red, Black, Blue, Yellow, Pink, Lunar Wolf
Ninja Storm, Red, Yellow, Blue, Crimson, Navy, Green
Dino Thunder: Red, Blue, Yellow, White
SPD: Red, Blue, Green, Yellow, Pink, Shadow, Omega
Mystic Force: Red, Green, Yellow, Blue, Pink, White
Operation Overdrive: Red, Black, Blue, Yellow, Pink, Mercury
Jungle Fury: Red, Yellow, Blue, Violet, White, Bat, Shark, Elephant,
RPM: Red, Blue, Yellow, Black, Green, Gold, Silver,
Samurai: Red, Blue, Green, Yellow, Pink, Gold,
PR 2012: Red, Black, Blue, Yellow, Pink
That would be quite an epic ranger battle. I hope the PR adaption will shoot something along those lines.