Might as well be talking about two different games with 10 or 15 boxing versus 4 or 5. Also, killing blows isn't the point of BGs. I'm sure most of us already have Bloodthirsty. Being kited around as a 10 boxer is exactly the reason to not have that many toons controlled by one person in BGs. Even if you're unkillable it doesn't help when you need to control multiple nodes.

I guess I just don't see the point in PvP with 10 or more. I'm always amazed at those who solo raid, but in PvP if you can't kill everything around due to sheer brute force and over healing with 10 or more toons then you have issues. A 4 or 5 man team is often outnumbered and that's where the multiboxing skill makes or breaks the fight. I don't understand how you can't see it being terribly different between 5 boxing and 10 boxing.