Big Joe was arguably, very arguably because I would say Jagr deserved the 2006 Hart, the best player in the league for one season: 2005-06. Connor has five Art Rosses, four Lindsays (deserved another in 2022), and I'd say he was the best player in the league in 2017, 2018, 2021, 2022, 2023...and being the first player to win the Smythe on a losing team in almost 50 years tells me he was probably the best player in 2024 as well. He also finished with a higher points-per-game than Hart winner MacKinnon.
Even Sid and Ovie have never had as many "best player in the league" seasons. You're pretty much only looking up at the big four of Gretz, Mario, Orr, and Gordie at that point. Jagr gets bumped out of that category because during his Cup runs he was basically Mario's RNH and never had the insane postseasons Connor had in 2022 and 2024.