So a guy who was on the 5 yard line, allowed himself to get backed 10 yards deep into the endzone, is getting revered because he didn't get tackled for a safety?
He should have never been in the endzone in the first play. You can whine all day about heart, if he had gotten tackled in the endzone, he would have been because he's too stubborn for his own good. You want to know why he's not starting, there's your answer. RB's must learn how to go down. 9 times out of 10, thats a safety.
Just because you luck out of one, doesn't mean you should continue to do it, play after play. You take the loss of yards come out for the next play. You don't risk the entire game for some stupid pride.