IF all you needed was physical ability and experience then why are virtually all the starting L's in the NFL high draft choices?
True but it is mainly bc it is a premium position that you have to have.
There is a better chance to get one drafting higher, no doubt. Same with Edge rusher, CB, and Qb...the other premium positions.
However, it isn't impossible.
Eagles Jordan Mailiata was a 5th rounder. Future HOFer Jason Peters was undrafted.
Villenueva from Pittsburgh was undrafted. Bakhtiari was a 4th rounder.
Terron Armstead was a 3rd rounder.
I could go on but it isn't a prerequisite to be a high pick.