That's an interesting comment with a lot of implications. For instance, it virtually rules out a DL at #23 -- how is a Tyson Jackson or Jarron Gilbert going to contribute significantly year one behind Seymour, Warren & Green? It raises Sintim above almost every other OLB candidate (and precludes him moving in to SILB). It makes experienced safeties like Delmas and Chung good bets, even if they're questionable "value" on most boards, and puts them ahead of an athletic specimen like Sean Smith who would be changing positions. I'm not certain I agree with any of those choices.
I happen to agree with BPF to a certain extent. If you look at Belichick's history of 1st round picks, it is clear that each of them were expected to get significant (eventually starter) minutes in year 1. Maroney might be the only exception, though he did get a lot of touches (dozen or so per game) even with Dillon on the roster.
Along with the inexplicable need to draft the same letter in multiple successive years (Warren/Wilfork/Watson, Mankins/Maroney/Meriweather/Mayo), I think you can draw some conclusions here. I do think that eliminates a 3-4 DL from the conversation...except for Raji if they consider him a true 3-4 NT (which are rare). I think it also eliminates QB, RB, TE, OL (unless Kaczur/Neal is being replaced). That still leaves:
WR - Not a slot guy and should be able to get open deep
ILB - Not a "2-down" guy...if that term even applies anymore
CB - My guess as to where they would like to go at #23
S - Like Meriweather, someone that can play all over the field
OLB - Lots of candidates already, but shifting to ILB/DE keeps this position in play
Obviously having extreme value drop into your pick range would be an exception to the rule (the Raji example above), but outside of the top 10 I don't see that happening. One thing I kinda disagree with BPF on is position change. It does add a risk in evaluation but that is countered to some degree by position flexibility.
As for Barwin, I can't see the Pats taking someone in the first round who hasn't demonstrated the ability to hold up in the running game. If he isn't able to set the edge and turn off-tackle plays back inside, you are looking at Steve Martin/2002 all over again. Other players over-compensate for the weak spot and the scheme starts to unravel.