I don't think he's bias, he's just an idiot who makes every single play out to be the greatest thing he's ever seen. He over reacts and over blows every play, every player and every team in real time as he watches them.
For example, the naked screen to Pollard that Slay made the instant tackle on. Anyone who knows anything about football could tell the play had zero chance to succeed because Rush took waaayyyyy to long to get the ball over to Tony. Slay was about 5yds off the line and there wasn't a single player between him and Rush. He could see the entire play unfolding in super slow motion as Rush lazily stepped back and telegraphed his lobbed throw of 15yds to Tony. I'm 50 and out of shape but I could have made that play. Ol' Collinsworth makes it sound like Slay is an amazing player, who just made this incredible read and insane play on a great RB in the open field to save a game winning TD.