If Kaku is as good as he was before, Asura might be necessary to deal with Yontoryu again.
Just because Zoro's firepower is million times higher than in pre-TS, Yontoryu didnt become anything less problematic.
However, technically, it is possible to deal with it with large barriers but whether he would do that or not, up to Oda.
If I had to guess, he would use Asura sooner than King of Hell in this match-up.