I think there is a very real chance that Parsons falls further than he is currently being mocked.
As a general rule, Inside Linebackers tend to get talked up prior to the draft, then slide. The premium positions are QB, Edge, CB, and OT go first. We've all seen and even used that argument, and yet... every year there is a linebacker or two that gets talked up... but most years, they slide.
Look at last year. "Simmons is a star. Simmons is a stud. WHAT A PLAYMAKER," they screamed. He went 8th. The next possible ILB type, Kenneth Murray went 23rd (and is playing outside in a 4-3 anyway). Chaisson went at 20, but is a pure Edge.
Now, I will admit, sometimes an ILB will rise a bit (2019), but most years... they just don't.
Will Parsons break that glass ceiling? Well... there are three QBs thought to be going early... and Sewell... and we have not even mentioned any other Tackles or Edges yet... and no CBs at all...
I think he'll slide a bit, especially given the real needs of the truly awful one win teams this year. Taking an inside destroyer is a bit of a luxury for teams trying to obtain a QB (or protect them... I'm looking at you Cincinnati). The Giants might do it, but they really need help for their QB as well. So... how far does he slide?
I wouldn't be surprised to see him slide as far as Simmons did... maybe a bit more, which would bring him to the approximate range of the Houston pick.
Last year, I argued with a dozen posters that (sigh) we didn't have to trade up for Tua. No, I'd say... he isn't worth all three of our draft picks. Hold your water... don't wet yourself... play poker. Fortunately, Grier agreed... This year, I think we might play the same game with Parsons.