I would say Dez belongs in the 88 club but he's the third best 88. I'd go Irvin, Drew, then Dez.
Irvin is my top guy because he played in an era that stats were harder to come by. Back when he played getting 100 catches a season was unheard of. Herman Moore and Cris Carter I think were the first to do it. Now the league is more pass happy. Back when Irvin played the climate of the offenses were different. It was more common to be run first with a power running back who was your #1 back. The days of Emmitt Smith, Barry Sanders, Barry Foster, Thurman Thomas, Ricky Watters, etc. Most teams focused on the run and there wasn't a lot of tandem running backs that split time. Also Irvin played against better competition on a regular basis at this point in his career. Darrel Green, Eric Allen, Aeneas Williams played against Irvin twice a year being in the division. Not to mention Deion Sanders, Rod Woodson, Eric Davis outside of the division. All of those guys were as good or better than Richard Sherman. I believe Williams, Allen, Sanders, and Green are all in the HOF. Irvin and Drew played in pre-salary cap days were you could load up on the roster, which I think the salary cap era is weaker than the pre-salary cap era. Irvin dominated in the pre-salary cap era and the salary cap era. Dez struggles to get separation against top flight corners and has trouble beating double coverage. that's all Irvin had in his career. People like Josh Norman aren't even in the same league as Allen, Williams, and Green.
I think Dez has lived up to the 88 number but he's a distant third as of right now. If he cleaned up his route running and performed better against better competition then I can see him gaining ground.