Every final in the 80s was missing a genuine contender, with the possible exception of 81. And had at least 4 riders that you couldn't see winning a ride.
Zmarzlik as you say is an all-time great - if GPs were present in the 80s, would Nielsen have cleaned up from 83 onwards and we be bemoaning the lack of competition? - but the title went to the last heat. Holder, Bewley and Lambert are improving each season. Woffy reminds me of a post-77 Peter Collins, both he and Doyley would have an outside chance in a one off final, unlikely to be world champion agsin in this format, but are top ten riders. Freddy, Vaculik and Mads capable of pushing Zmarzlik close if they have a great season, though I can't see any of them being world champ.
The rider we still miss in this era tbh is Darcy.