"You can be as good as you want. But if you don't play with the right fundamentals, the right technique, you can become the worst player out there, not knowing what's going on, not knowing down and distance, backfield sets," Alexander said. "There is a lot of stuff that goes through your mind.
"Jeremy always stressed playing with good technique. He would come tell me, 'You're a better athlete than me but you need to start playing with technique and put it all together. If you do that you'll be great.' That's what I've been trying to focus on."
The highlight play of Alexander's career was when he sacked current Tampa Bay Buccaneers quarterback Josh Freeman, forcing a fumble in a win over Kansas State his freshman year.
But the highlight games were two Big 12 title game appearances.
A month after sacking Freeman, Alexander recorded 3.5 sacks in Oklahoma's lopsided win over Missouri in a rematch in the title game.
Last season, Alexander matched his career high with four tackles for loss against Nebraska in the Big 12 title game.
"If I can get back to playing like that it's going to be good," Alexander said. "The key is I've got to be consistent. You can't do it one week and then come out slacking the next week. My big thing is to stay motivated and stay focused.
"I feel this was my best camp. I'm a lot older and wiser now. A lot of things I used to give in to, like saying it was too hot, things like that, I fight through it now. I have to be that light for the younger guys."
Alexander is focused to make his final chapter his best chapter.
"This year is a big year for me, school-wise and on the field," Alexander said. "I'm close to getting my degree. This is my last season at Oklahoma. I want to showcase my talents and put it all together."