Fury scraped past a very old Wlad. Since then, his major wins are Deontay times 3, who remains untested. Needs to unify or he is behind Wlad by a margin, who isn't even high on the ATG HW list. Think about Gatti vs Ward. They fought 3 entertaining fights, but were not beating the top fighters around 140-147. Similar situation applies. Fury needs proof against someone else. Whyte was a very small step.
It will be interesting to see how the Ring and TBRB react to this retirement. This concept of lineal has had so many exceptions and contradictions since Lewis' retirement. For example why was Vitali never considered a lineal champion when he won the Ring belt, but Wlad was? Why do some retirements mean the lineage ends, but others don't. Fury is the man who beat the man (in Wlad), but he did actually retire in Oct 2016, which resulted in #1 v #2/#3 when Klitschko v Joshua happened. If retirements don't count, what happens if Lewis has a pro fight against Mike for example, does that mean Fury was never lineal, or he is on a different branching lineage? How many different branches do we have right now? Good luck to any of us trying to make sense of it.
I don’t think anyone actually believes he’s retired this is just an attention-getting, increase interest ploy