But what use is his stealing chakra if the enemy will use it, then gain it back next round. It would be different if the Justus didn't immediately take the chakra. Though, Kisame is a good counter to avoid Breeze Dancer-Itachi teams from going full-on nuke on your team. But no good since opponent will use all chakra available before you use Kisame's mystery. Again, if the Justus didn't automatically take the chakra, Kisame's mystery would be more effective.