It's obvious that BB values the TE position. Just look at BB's
draft history concerning tight ends.
2000 Stachelski
2001 Holloway and Love
2002 Graham
2003 Nead
2004 Watson
2005 Stokes
2006 Thomas, Mills
2010 Gronkowski, Hernandez
2011 Smith
2007-2009 marked an unusual drought of tight end picks for the Patriots. Although Watson was the starter in that time period, the lack of TE picks is rather unusual. Overall BB has selected 12 tight ends in 12 years. Without a doubt he values the tight end position very highly.
The nature of the tight end position is unique in that it's a hybrid position. A TE is expected to block as well as to go out on patterns to receive catches. Considering that a TE is by definition a dual responsibility position, a good TE should have skills in both areas.
But individuals have different strengths. The TE who is adept at both areas is rare, that would be Gronkowski. There are TEs who specialize more in the passing game, that would be Hernandez, and there are TEs who are adept at blocking, that would be Crumpler and hopefully Smith.
I really don't see where the problem lies in carrying specialist tight ends with different strengths and weaknesses. The TE position is one of the most flexible positions on offense, particularly the way that BB employs them.
And now that BB has very obviously signaled the Pats offensive transition to the power running game by drafting Two RBs, Two OL, and a Run-block first TE, it's logical to reason that good blocking TEs will be more valuable than ever for the Pats offense in 2011.