Phil, for all his shortcomings, is an outstanding coach and psychological master. He generally seems to point to external factors during a game or series as the reason for losses or opponents' runs, but I think he's just trying to emanate supreme confidence, knowing that if he has the right personnel, confidence is essential to playing good ball. Just like Red used to tell guys who were missing shots that he'd only pull them if they stopped shooting, because he understood the importance of confidence. Phil's not gonna say his team can't win or can't rebound or can't get through the Celtics defense, because he knows that to do those things, his guys need to believe they can.
As for Pierce comments, I'm sure he, like everybody else, was asked about it. Why shouldn't he be saying it? I understand Pierce's situation, he was probably scared that it was a lot worse than it turned out to be. He admitted himself he was embarassed by it. If it was Kobe, we'd all be saying the same things. And honestly, didn't Phil play with Willis Reed? If I was a teammate of a guy who did something truly inspiring and heroic, and a guy who wasn't really hurt as badly was being compared to my ex-teammate by the media, I'd be a little annoyed too.
The absurd Reed comparison does remind me of one of my favorite Russell stories, though. When he was asked about the Willis Reed situation, which was a year after Bill retired, he said that situation just showed how soft Wilt was. Russell said he would have taken it to Reed, abused him and made him look foolish on principle just for daring to come onto the court and try to play against him injured. That situation right there, a year after Bill retired, is why Bill won 11 titles and Wilt won 2. Similarly, if Bill was there and Pierce came out against him, I think Bill would have made sure his team took it to Pierce and made him work if he was going to contribute anything, not allow him to be left wide open for two straight 3s. I'm just glad there's no other Bill Russell, not on the Lakers or on any other team. NOBODY will ever match him.