Toushiro would get stomped bad, The ice wouldnt freeze Kenpachi due to his Extremely High lvl REitsu and Toushiro stands no Chance in Power and Swordsskills against Kenpachi.

Only thing TOushiro can do is Run and attack using Ice.
But sooner or later he would have to go hand to hand against Kenpachi which is really just his Death Funeral.
Kenpachi is a Brute with swords and will Slash Toushiro in half.