By Arnie Stapleton
AP Por Football Writer
ENGLEWOOD, Colo. — The Super Bowl champs begin training camp Thursday with major questions on both sides of the ball, beginning with who will be the one throwing it.
General manager John Elway declared the Denver Broncos’ quarterback competition wide open.
Coach Gary Kubiak said he’ll split snaps between Mark Sanchez, Trevor Siemian and Paxton Lynch, beginning — but not set — in that order.