I think you go by the talent at each position. This is one of the best OT drafts EVER! In my way of thinking, there is no way we should pass on one of the 4-5 players who can come in & become our future franchise LT. Flozell will be 31 & is coming off his worst injury ever, and Fabini will be 32 before TC. Pettiti is strictly a RT. The jury is still out on Columbo, & we have all seen that Tucker is a stop-gap at best. That doesn't bode well for the future.
With Ferguson, Winston, McNeil, Justice, O'Callaghan, and maybe even Scott, Colledge, & Whitworth, there are at least half a dozen OTs who can man the most important position on the line. These guys don't grow on trees. I'm talking giants who are coming out this year. Half of these guys are over 6' 6". McNeil is 6' 9", 335lbs.! We can get a very good starting OLB in the second round, but not a LT. Same goes for a FS. By the time our pick comes up in the 2nd rd., I don't expect ANY of the aforementioned players to be there.
So, we take a guard-big deal. We still would have blown the chance to obtain a quality player at one of the hardest positions to fill in the NFL. Don't think so. Then why are so many LTs franchised by their own teams every year? My point exactly.