Kakashi can definitly deal with Sasuke, if only for the reason he was nominated as Hokage.
Also don't forget how killer-bee nearly one-shotted sasuke twice, if it wasn't for karin and juugo his ass was toast. Using mangekyou 3 times has already started to affect him.
People need to stop overrating Sasuke, especially now that he has lost the curse seal and Oro's healing.
Kyuubi and Sage Naruto are far beyond him and Kakashi is just hax.