You're very obviously leaning on the "Cups" argument, but Jagr won his Cups in his literal first two seasons backstopped by an amazing roster (which he obviously contributed to). When he was in his prime, i.e. when he was Jagr, he didn't even come close. And he certainly never had a couple of playoff runs like McDavid has had.
Want to try again? Outside of last year, Jagr easily has the better playoff success without winning Cups, albeit its not by much, but it is there. And captain obvious, but lets pretend Draisaitl is gone 4 of the 7 years; where would the Oilers finish, let alone even qualify? That is what Jagr had with no Lemieux. It is rewriting history, but the 90s Penguins easily couldve been a dynasty team if Lemieux was healthy. Obviously McDavid is Lemieux and Jagr is Draisaitl in terms of production, but you get what Im saying.
94-95 - lost in 2nd round (No Lemieux)
95-96 - lost in Conference Finals
96-97 - lost in 1st round
97-98 - lost in 1st round (No Lemieux)
98-99 - lost in 2nd round (No Lemieux)
99-00 - lost in 2nd round (No Lemieux)
00-01 - lost in Conference Finals
16-17- lost in 2nd round
17-18 - missed
18-19 - missed
19-20 - missed
20-21 - lost in 1st round
21-22- lost in Conference Finals
22-23- lost in 2nd round
23-24 - lost in Finals
Lastly, yes Cups are a huge asterisk on every players legacy, whether they win it their rookie year, Conn Smythe it, or are a third line old man role player. Its important.