I have much more of a clue about this than you do my Canadien friend, because it is a fact that NFL GM's know that guards are easier to find than other positions, it is an easier position to play on the line than the other line positions....that is a fact, and all your rhetoric doesn't change those facts.
Its about value, you simply don't use a top 20 pick on a guard, unless its an extremely rare guard, and there aren't impact players at other positions availalble, that WILL not be the case in this draft.
There are impact players at DB, LB, OT, and maybe even QB that will be available that you DON'T draft a Jean Jiles over.