I'm glad to see Marco back. He was the epitome of Tech recruiting, imho. Nobody wanted him out of high school because he was a classic tween; too slow to play LB and too small to play DL. All it took, however, was one look at his high school stats (if I'm not mistaken he had 26 (!!) sacks in his senior year) for Ross to take him. And, sure enough, paired with another supposedly wasted recruit, Coleman Rudolph, he grew up just enough and became one of the best DLs in Tech history.
I don't see any reason why he can't do the job as DL coach at Tech, even given his limited coaching experience.