First, you are spot on with Cox - he was a run and chase OLBer at NDSU in their 4-3. But LSU did have him play inside and out in their 34. I think he works all over. Move him around, get him into spots that will highlight his strengths.
As far as after your top 4:
McGrone - I like him, he is a bit raw. But has that Devin Bush feel to me that worked out so well for Pittsburgh.
Dylan Moses - if not for his knee injury late in the 2019 season, I think he is a borderline 1st. He has that athleticism to run and cover and can hit. He'd be a get in day 2.
Peter Werner - a SSLB at Ohio State - is is athletic, can cover and is strong at the point of attack. I think he works inside in a 34
Baron Browning - The WLB for Ohio State -raw, but crazy athletic upside. I think he might work inside as well. He has the size to do it.
Jamin Davis - If he is anywhere near 235 lbs - I'd gobble him up as my next ILB. Vastly under rated.
Don't waste your time looking back, you're not going that way. - Ragnar Lothbrok