Neither really have "upside". Hunter has the physical traits but has only ever performed consistently during practice and offers no ST value at all. I know your point is that we have other guys to take over ST duties but you still don't keep 5th and 6th guys who offer no ST value, at least typically. DHB on the other hand is still one of the best punt cover guys in the NFL and is (most likely) still the fastest guy on the Steelers roster. When Shazier, AB, and whomever else raced each other a year or 2 ago they wouldn't even let DHB in the race because they knew he would beat them.
On top of that people still write DHB off but with that speed he remains a good guy to send on a vertical route and take the top off of the defense. His speed is hard to match and despite his history of drops early in his career he has very few drops as a Steeler. Add onto that his locker room and coaching presence and there is no way he goes and shouldn't. There are 3 WR's who deserve to make it over DHB. AB, JuJu, and Washington. DHB is the 4th. The competition for 5th, 6th and beyond are all of the other guys though it will likely be Tucker and Hunter.
That is already Jewells position no? I don't think he ever played OLB.
Still salty the Steelers didn't take him.