And Marmion says it with confidence because Robinson, a Notre Dame commit, should be on a college weight program.
"He's going to go in the spring and plans on being there for spring ball," Marmion said. "They'll have him 205 by freshman year. He's doing everything he can here academically to do that."
If Robinson's approach in the classroom is as dominant as he's been on the field in two games, enrolling early won't be an issue.
Although the Lions are 0-2, Robinson is continually beating double coverage and has 18 catches for 289 yards and five touchdowns.
"He's doing very well," Marmion said. "He's elevated his game even from last year. His confidence is up. He is demanding the ball. He was getting double coverage all night (last week) but he is playing well.
"He's really worked on his breaks, in and out. He's a little faster. He clocked some high 4.5s (in the 40-yard dash) for us this summer. He popped two in a row for us. He's definitely a little faster. He's such a smart kid and things are more second nature. He understand coverages and where to go to get open."
One thing that helped Robinson develop over the summer was his participation combines, particularly when he went to The Opening in July and competed against some of the best cornerbacks in the nation.
"There is where he had the opportunity to see where he fits in the big picture," Marmion said. "His parents did a great job of raising him and making sure he knew he wasn't different from anybody else despite his father being a basketball player (his dad is former NBA star David Robinson)."
"But he is different than anybody else on football field, and he's starting to release that."
Robinson has a 36-inch vertical and very good ball skills, but it is his mind that jumps out Marmion when asked for Robinson's great asset.
"He's such a sponge. He wants to know everything completely," he said. "We've seen this year he is coming out a much more intense competitor. I think that is from the combine.
"He is playing at level if ball is in air, he thinks he owns it."