Kakashi Would Have Used Kamui against Kakuzu and Would have Been Hospitalized

Kakashi:
Is that how you guys see me now, is it?
That's somewhat depressing...
... well, I got off without having to use Mangekyou sharingan this time so...
If you guys didn't come running in like that,
I would have used it, for sure.
And right about this time, I'd be like how you imagined, sleeping in bed
ahaha