How can there be Kenzaki without Aikawa Hajime??? D:
They are good friends!! Err... Wait... That's the whole reason why Kenzaki went away - to prevent the possibility of battling with each other =(
I've always written family name first because that's how it's spoken, that's how I say it, and that's what I'm used to. And I'm not changing now. If you prefer to write it as given name -> family name, then write it that way. If you don't, then don't. Simple as that.
They said Kenzaki Kazuma in the preview. That's all the proof I need for Tsubaki to be playing Blade.