Speight, who was spotted at a UCLA practice last week, started 11 games for Michigan in 2016 and four more in 2017.
Mora believes Rosen will need to be tested despite expectations that he will be a first-round pick in the 2018 NFL Draft.
Josh Rosen has been called by many pundits the most pro-ready quarterback in this year's draft.
Dilfer said at least half of the people who meet Rosen won't like him, but whoever passes on him will regret the decision.
Rosen confirmed Wednesday he will enter the NFL Draft despite rumblings he would stay in school if the Browns secured the top pick.
2018 NFL Draft Watch: Tuesday's three college bowl games lost some of their luster with two of the nation's top quarterbacks not playing.
Josh Rosen reportedly would rather play for the Giants over the Browns and would consider his options if Cleveland honed in on him.
Josh Rosen is still in concussion protocol after suffering the injury in the Bruins' final game of the season.
Cody Riley, Jalen Hill and LiAngelo Ball were arrested for shoplifting in China prior to the team's first game of the season.
If either Ball brother signs with an international team, he would forfeit his college eligibility in the United States.