Cyrus Gray

Questions abound on offense, defense for Super Bowl champs

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.

"Gary is very seasoned at that position, so I know he's going to handle it the right way and we'll find the right guy," Elway said.

There are also unknowns on defense such as when star cornerback Aqib Talib and pass-rusher DeMarcus Ware will be cleared to practice.