Looking back on it, there's a lot of unintentional comedy in Bart Scott's argument. This segment aired on 11/17 (I believe this is an accurate date since it was published by the NFLN Youtube channel) during the week after the Patriots lost to the Seahawks, putting their record at 7-2. After that the Patriots won the next 10 games in a row, including the playoffs.
There is no doubt that Belichick has an ego. Anyone who has reached the position of head coach in the NFL has a healthy ego. I think this board has done a good job cataloguing the times it's been reported that Belichick has pulled rank on subordinates or overruled a decision making process to go with his own way and gotten burned by it (the Chad Jackson draft choice comes to mind.) The difference is, Belichick has either made enough correct choices on his own or realized when he's better off suppressing his ego and going with the group decision to offset the poor decisions. In those situations, Belichick's ego is a net positive for the team or he subverts it enough that it's not an issue in the decision making process.
Another point that Scott makes is that Belichick doesn't show loyalty to players and he believes this will have a negative effect on the roster as players won't go the extra mile or play through injury for the team. He cites the Steelers keeping Troy Polamalu after his prime as an example of something the Patriots wouldn't do. While there is a positive side to a team showing loyalty to a veteran player, there's also a negative that Scott doesn't seem to be aware of: Players may come to the same conclusion about not giving their all if a team has an "untouchable" veteran who is locked in as a starter even though they no longer deserve based on their play.
tl;dr - Bart Scott's football analysis should not be taken seriously.