Pretty much echoed my concerns. Great athlete, looks awesome running and tackling. Didn't make very many plays in college though which is a big red flag. In a way sort of like Jalen Ramsey. He could be a big time player or he might just be a big time athlete.
They are somewhat similar in terms of being outstanding athletes with somewhat underwhelming stats, although it is fair to point out that Jack had more career INT's than Ramsey in basically a full season less of games. I also think the big difference between the two is that Jack has such rare cover ability for a LB, it's something I've almost never seen from a LB his size, Ramsey doesn't have any traits like that.
And another thing, there is this idea that Jaylon Smith is such a superior prospect to Jack but his production is no better than Jack's.
Over their first 2 seasons Jack had 15 TFL, 1 sack, 3 INT's, 18 PD's, 2 FR's and 1 FF, Smith had 14.5 TFL, 3.5 sacks, 0 INT's, 5 PD's, 1 FR, 2 FF.
Of course Smith had a full season while Jack only played 3 games as a junior but Smith's stats as a junior are almost identical to the year before, he was no more productive than Jack at all and you could easily argue that assuming Jack is 100%, he's the better prospect because of his rare coverage ability.