MOBILE, Ala. — Tanner Lee spent his entire college career searching for the right offensive scheme.

He thought he'd found the perfect fit twice, only to see the system leave when his head coach ended up on the firing line.

When Tulane fired Curtis Johnson and brought in Willie Fritz's zone option to replace Johnson's Saints-inspired scheme, Lee chose Mike Riley and Nebraska over LSU. 

He had an entirely different set of options when Riley was fired and the Cornhuskers hired Scott Frost this offseason. Offered a choice between staying in Frost's scheme, earning graduate status and transferring for the second time in his career or betting on himself in the NFL draft, Lee chose the NFL. 

"Part of the decision was whatever offense they run may or may not fit my skill set, which I think is ready for the NFL," Lee said. "The NFL and my skill set are aligned, and I was just ready to take that step."

A foot injury to Oklahoma State's Mason Rudolph has given Lee the perfect opportunity to prove himself this week. Lee, who was initially left off the Senior Bowl rosters in part because game officials weren't sure if he was eligible — he hasn't graduated yet and had another year of eligibility — now gets to throw in front of the entire NFL. 

And he's getting a chance to do it right next to Oklahoma's Baker Mayfield and Wyoming's Josh Allen, two of the top four quarterbacks in a draft class that is supposed to be one of the deepest at the game's most important positions in years. 

Mayfield and Allen, along with USC's Sam Darnold and UCLA's Josh Rosen, are all currently projected to go in the top 15 picks, and Lee is sharing repetitions with them all week. 

"That's part of this deal," Lee said. "You get that opportunity to showcase your skills in front of the best, and these are extremely talented quarterbacks, 'the' guys of college football the past year, so it's going to be a lot of fun."

Lee does not have the resumé of some of the other passers in Mobile this week. He was beaten and battered in two seasons as a starter at Tulane, but his talent was clear. When the Green Wave hired Fritz, Lee had a chance to stay in Louisiana; he visited LSU in early 2016. 

Nebraska felt like more of a fit. 

"It just came down to timing and fit, and I think I just felt more comfortable at Nebraska," Lee said. "It was just one of those decisions where you have to go with your gut."

Lee, a Destrehan native and Jesuit product, started slowly when he got his chance to start for the Cornhuskers this season, tossing seven touchdown passes and nine interceptions in Nebraska's first four games.

But he settled down, finished with 3,143 yards, 23 touchdowns and 16 interceptions, and he clearly has the tools the NFL wants to see in a quarterback. Lee measured in at 6-foot, 41/8 inches and 218 pounds on Tuesday, and his hands, a key measurement for quarterbacks, are enormous at 101/8 inches.

"When the occasion arose for him to come here, we we were really excited, because Tanner's got throwing talent," Senior Bowl executive director Phil Savage said. "There's no doubt about that. For him, it's going to be a matter of consistency during these three days of practice."

Consistency has been a problem at times. Lee completed just 57.5 percent of his passes, and the 16 interceptions he threw was the second-most in the country in 2017. 

But Lee, unlike Mayfield or Washington State's Luke Falk, does not have to worry about making the transition from the spread offense to an NFL offense that will require him to play under center. 

Lee believes he's perfectly suited to play in a pro-style offense. 

"The concepts that I learn this week to run in the game, I feel like I've learned at either Tulane or Nebraska, so I'm extremely comfortable with everything we're running this week," Lee said. "It's just going to be that much easier to relax and play ball when you're comfortable with the playbook."

And this time he doesn't have to worry about the scheme being pulled out from under him.

Follow Joel A. Erickson on Twitter, @JoelAErickson.

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