Not sure about the nickname, but I am sure about the positive impact Kemba has had. He's a willing passer, moves like crazy off the ball (can rarely remember Kyrie doing so), and most importantly, he is actually a good defender.
I remember that many were posting about how Kyrie and Kemba were essentially equals on defence. I had never been able to watch much Kemba in Charlotte, so I couldn't know. But my oh my is that not the case at all! I think that overall Kemba might be a general talent upgrade alongside the massive chemistry upgrade, considering how he consistently plays good defence.
It was a big time annoyance watching Kyrie show the ability to play good defence, but then simply not do it a lot.