I do agree with you (as far as my, admittedly, low ability to judge such technical matters as you can).
But on the other hand , this is why I am not big on the Combine. Those numbers represent athletic ability; not football playing prowess.
So I think way too often teams are enamored by "potential" meaning: not a real good football player but has lots of athleticism so maybe he could be.
And, I think those choices are fine with 7th round picks and UDFAs. But not with 1 - 6 round picks. They BETTER be good football players above all else.
I have no idea about Jackson. But he is small for an NFL corner, and what I'm reading says that he is a fabulous athlete and decent guy. But the NFL sheds those guys right and left because......guess what......turns out they don't play football very well.
The other issue I have with that is that if a guy has to learn how to play football, then his 1st (cheap) contract means he is learning and not producing. So if he ever becomes even a decent player, likely it'll be somewhere else.
This draft is going to tell me a lot about what McVay and Snead as a team are looking for: athletic potential or great college production from really good football players.