Problem is that Zubov played on a series of staked teams with a number of hof talents....
Leetch, Messier, Lemieux, Jagr, Francis, Modano, nieuwendyk, hull...
Not to mention other Stars/Rangers greats like Sydor, Lehtinen, Morrow, Hatcher, Verbena, Langenbruner, Graves, Amounted, Kovalev et. et.
Stars, Pens & Rangers he played with pre-cap were all top spenders with top 5 nhl rosters.
Conversely, Markov's early career was with a Habs team that was on a tight internal budget, and then even when it did start being a cap spending team, never had anywhere near the offensive talent or roster depth Zubov played with most of his career...
Koivu... a few years of late-career Kovalev & early career Subban... and that's it for anyone sniffing HOF caliber (none of which locks). It's almost comical how big the divide in talent they played with in their respective careers is.
Markov played with a player that topped 70 pts 3x in his whole career... zubov only had 3 seasons where no teammate scored more. Heck, he had a year where 3 guys topped 100pts lol.
& that's to say nothing of the quality defensive players & dmen zubov was surrounded with...
It's not at all a knock on Zubov, who was great & I'd agree underrated... but Markov is criminally underrated largely because he played with no elite talent for almost his entire career.