Fun fact, those dozens of clones can also use muso tensei. And how is Cream gonna keep track of the real Ken while going through the fakes? It's not like Ken is just gonna stand still and let himself be targeted. He's gonna run amongst the fray to observe his opponent.
Soryu tenra negates the abilities of whoever is caught in the AOE. So if it's not Ice, it's gonna be Cream. Meaning no void powers. Meaning that while Ice is in the void, Cream is gonna be fighting Ken, meaning all the damage from Cream is gonna be translating to Ice. And Ken's got a major AP advantage.
Well, it worked well in his fight with a Muso Tensei boosted Raoh, Muso tensei is energy made up of nothingness (aka void), so it should work here.
The sphere still has to touch Ken, which is gonna be hard due to speed equalized, precog, ability to create clones to take hits, mislead Cream, utilize Muso tensei, ability to use telekinesis to use nearby objects to act as a shield, and can utilize Soryu tenra to bring Cream to a void where it's powers are gone, leaving it to fight Ken by itself, meaning that any blow to Cream will reflect back onto Ice, killing him instantly,