I didn't say anything about his game calling or his defense...I talked about his value to the pitching staff. That takes into account a number of things, the majority of which are behind-the-scenes. I really wish there was a way to check this, but I guarantee if you did an anonymous survey of all the arms in the league as to what catcher they want to throw to, Tek would get the majority of first place votes. Pitchers love this guy...there has to be a reason for it even if we don't see it on the field.
Regardless...Tek's days are numbered in Boston for the first time ever, IMO. He's the 2010 catcher, maximum. If his replacement isn't Kottaras, then we'd better start looking around soon.