No, it's that they have different niches. You can't devote all the time of the panel to discuss stats, whilst PPD is more flexible in that regard (and that he's one of the best captains in the history of Dota helps). He's personally played against many of those players, and can show us more of the mindset of players. That and PPD is the saltlord, he can banter very well with a panel so it doesn't feel as much as he's the only one talking. All of Nahaz's problems (other than twitter rants perhaps) would be fixed if he just got his own short segment, kind of like the weatherman but with stats. After TI7 there will be Midas mode, where Nahaz will have an opportunity to change his reputation around if they handle it correctly.