... and new faces emerge as the top dogs as old dogs move on to new stomping grounds or new careers. 

When a team's best player runs out of eligibility or leaves early for the NFL draft, it can have drastic repercussions for the entire team. Sometimes there's another player waiting in the wings who's a chance away from becoming a star.

And sometimes there isn't. 

Here are the 10 players filling in the biggest shoes in the country. Gone are the likes of Tim Tebow, Colt McCoy, and C.J. Spiller.

Welcome to the party John Brantly, Garrett Gilbert, and Andre Ellington. 

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