Wouldnt Cain/JDS fit that bill more than Fury/Wilder? they were both in their 20s, both had a ton of momentum coming off of dominant wins over top opponents. Whereas Fury went into the Wilder fight having looked terrible against two cans, and was visibly out of shape, only being back for like 6 months after almost 3 years of inactivity where he had had a mental breakdown and ballooned up to around 400lbs. Wilder was coming off of a life and death fight against a 40 year old Ortiz which was his only win at elite level. Cain and JDS were the consensus two best HWs at the time, whereas Fury was randomly promoted to no7 by Ring magazine once the fight was signed, pretty much everywhere had AJ ranked no1 and Wilder no2. Cain and JDS are both largely viewed as top 10 HWs ever, Cain more like top 5. Wilder is probably in the 30-50 range and Fury still has work to do to solidify himself as all time top 10.
In 2018 the fight everybody wanted to see was AJ/Wilder, when Fury/Wilder, a much smaller fight on paper, was signed instead there was as much "wtf?" as excitiement. The consensus was Fury was too ring rusted, out of shape and pillow fisted and would get his head taken off, the knockdown he suffered at the hands of cruiserweight Steve Cunningham was often cited. The final fight in the trilogy was viewed as unnecessary and an obstacle to unification more than anything, again this was like the consolation prize rather than the HW fight people wanted to see.