Herm Edwards [along with many other commentators] has said that, all other things being equal and you have a right-handed QB, that you'd prefer greater "extension" [arm levers] for your left tackle "so he can keep the pass-rusher from getting into him", where all manner of "moves" would then be avoided.
Although ZMart isn't ideal on extension, when you watch his play you see his rapid staccato feet pumping and adjusting as he blasts the rusher off him with his two-hand "punch". A powerful punch and tremendous feet can make up for less extension, especially in college.
Having said that, you'd like your Right Tackle to be just as good, of course, but life isn't that way. So you take your second best "feet", "extension", and "punch" guy and install him there. On our team, Hiestand looks to have fallen into good fortune with ZMart, but not any number two. Lombard is OK. NMart seems like his brother, but probably less "feet". There then sit Stanley, Elmer, and ultimately McGlinchey. McGlinchey seems the quintessential "extender". Stanley seems the best "feet". Elmer seems the best brute. You're Hiestand: who do you pick?
Well, the best combinations for the tasks of course, and we don't know who that's going to be. Almost everyone sees McGlinchey as a redshirt, but what about 2014? Everybody sees Stanley as a real jock, but with ZMart in place, is he a better RT combination athlete than Lombard? Would you rather train him there, or train him to replace ZMart? Elmer is Mr. Potential, immediately. All the camps said this guy is an a$$kicker. That to me means "power", "extension", AND "feet". Good enough for LT? Who knows? Good enough for RT this year? I wouldn't doubt him.