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Marcus Mariota’s development is at the center of everything the Titans want to do in the coming years and the quarterback’s performance as a rookie showed plenty of promise.

Mariota isn’t a finished product, however, and there was a reminder of that on Monday night. The Titans held an intrasquad scrimmage at Nissan Stadium and coach Mike Mularkey said when it was over that it was “a really good night for our defense.” Mariota was intercepted by safety Damion Stafford and was whistled for a false start on a night that didn’t unfold as he’d like.

“It’s unacceptable, my play today,” Mariota said, via the Tennessean. “I can’t be turning the ball over like that. I’ve got to be putting these guys in better situations. But all in all I’m glad we were able to come out and finish the drives that we did, and we had a pretty good red zone [drill] as well.”

Mariota said he hoped he and the team would “learn and build off” the performance when they face the Chargers in Saturday’s preseason opener, which will also serve as a chance to say hello to former head coach and current San Diego offensive coordinator Ken Whisenhunt. The Titans felt he was the wrong man to usher Mariota to success and Mularkey’s job security will have a lot riding on avoiding “unacceptable” outings against teams wearing different uniforms.