I was just thinking of the same player when this question was asked. I also believe just saying 3-4 NT doesn't really define much as Wade Phillips used his NT as a one-gap penetrator, not just a space eater. I also agree he would be better suited at several other positions over NT but he could be used as a chess piece who occasionally lined up over center.....depending on who else you have on your line. It won't matter until they get A LOT more help. Look at Suh. He wasn't as big of an impact player when he had no help to draw double teams in the run game.
Oliver was even asked to work out at ILB & OLB so that shows what type of athlete he can be.
Oliver seems to be very disruptive but also played at NT last year. Some believe he is as twitched up as Aaron Donald but just not as strong at the POA. Can get locked on by OL'men.
Ed Oliver at 6'3 287 (4.75 40). Aaron Donald at 6'0 284 (4.68 40). Donald is obviously thicker. Look at Trey Flowers at 6'4 270 (4.93 40).
I think he could play 3T, 5T, 7T. 3-4, 4-3 you can just about put him anywhere in the front 7. Optimal position IMO would be 3 technique with a big two-gapping NT like Dexter Lawrence. That or at 5 tech with a big NT. Could also be effective at strong side DE in a 4-3 in the base and kick inside. If they want to be multiple, him and a big space eater would help a lot.