Jalen's took off not too much later, despite being a year younger.
But even Jalen couldn't have predicted he'd blow up on a national scale like he has, being ranked fifth nationally at defensive end and have nearly 20 offers, from schools across the country like USC, UCLA and Washington to Nebraska, LSU, Arkansas and the national champions, Alabama.
"I felt like I was prepared for it by watching Xavier but I never thought it would be like this," said Grimble. "I didn't think it was going to help me like this but I'm glad I watched closely when Xavier was being recruited because it's crazy."
Even when a few verbal offers came in, it wasn't till he was at a camp last June where he realized he could compete at the highest level.
"It was at the USC Rising Stars Camp and I was one of the few sophomores working out with the juniors," said Grimble. "That's when I felt I was a pretty elite player."
Offers from the West Coast schools came, but he in a sense, expected them. Then came out-of-region offers, and he was stunned.
"When LSU came out and then when Alabama came out, it was like a jaw dropper," said Grimble. "I was more than surprised. I was real happy."
There are still some schools that Grimble is hoping to get offers from.
Grimble was a part of Bishop Gorman's state championship basketball team this year, and while he was a bench contributor, he was a starter and major cog in their state championship football team. But because of basketball, he didn't get to many Junior Days, so he's starting to set up his spring.
"I have one unofficial visit for sure, and that's to Nebraska for their Spring Game," said Grimble. "And I may do some camps, but I've also already done them, so I'm not sure if I will do any more."
Grimble said that every school is making a big push, but no one has emerged as a leader.
"I can't even say a school is recruiting me the hardest," said Grimble. "I couldn't even give you one. All schools are really coming in with everything they've got. Right now, I'm still pretty wide open. It hasn't gotten to that phase yet where it's too hectic, but I can definitely feel it picking up."
Grimble stands 6-4, 250, and plays end for Gorman, but knows with his body type, a move inside in college isn't out of the question.
"I really don't have a preferred position because I feel like I can play any position, the three-technique or end," said Grimble. "But I just want to be on the D-Line."
Grimble is also not close to making a decision.
"I'm really not sure when I'll decide," said Grimble. "Me and my dad talked about a before-the-season commit. Then we talked about holding out a month before Signing Day. Then we talked mid-season. So I couldn't even say right now."
Academically, Grimble has a 3.3 GPA and is focusing on prep for the SAT and the ACT.