I think you just answered your own question! A "need" doesn't have have to be for this year, as you clearly know since you call Meriweather a need pick below. The Pats had a solid safety lineup already with Harrison, Wilson, Sanders, Hawkins, Scott. It's an urgent need for 2008, just like LT for the Colts.
Again, we agree. Which is why my post specifically said need-based reach. And once again, it's not the concept that bothers me in this case, it's the particular player. If he does become a legitimate starting LT, it's worth it. I'd just be nervous counting on that.