Okay this a fight of the hot heads.
Vegeta has all transformations except fusion and potara
Kenpachi still has no Bankai so that's obviously not a cannon idea for this battle, but he can still release his spiritual pressure when taking of his eye patch
Also for this battle vegeta is in spirit form sent from the planet of the kais and Kenpatchi cannot seal his spirit with the Zanpakuto. this is strength and rage battle.
The battle will be held in soul society, it shall run for 3 days. every 12 hours they shall have 1 hr rest be able to eat and recharge by half the power that they lost.
GIVE A Descriptive WAY THAT EITHER ZEKAKI OR VEGETA WINS. NO STOMPS