Whether Kamara actually kicked the victim, or merely landed a few shots then backed off, might mean something if you’re evaluating how to judge him as a human being.
But legally, in terms of committing battery resulting in substantial bodily harm, as a co-conspirator it makes no difference, he may as well have landed every blow and kick himself. In other words, assuming the conspiracy charge sticks, the state doesn't even have to prove Kamara landed x blow that caused the harm. He's equally responsible as everyone else involved (and they him).
That said, if Kamara can establish that his involvement wasn’t as egregious as the other defendants (or for example, he tried to call them off), it could theoretically make a difference in sentencing.