You're more than welcome to go and check:
https://www.hockey-reference.com/
You're the only one here who needs convincing and nothing anyone says convinces you, so have at it.
I dug up my post from a few years ago. I'm cutting it down to just the final two games, and updating it for the last few playoffs.
2017 Caps:
Game 6 - Lost 2-1 in OT (Matty 1G, Willy 1A).
Game 7 - Lost 2-1 in OT (Matty 1G).
2018 Boston:
Game 6 - Won 3-1 (Marner 1G 1A, Nylander 1G)
Game 7 - Lost 7-4 (Marner 2A and Willy 1A).
2019 Boston (up 3-2 in the series with two chances to close out)
Game 6 - Lost 4-2 (Matty 1G, Willy 1A).
Game 7 - Lost 5-1 (Tavares 1G).
2020 Columbus (5 game series, just the last two games)
Game 4 - Won 4-3 in OT (Matty 1G 2A, Marner 3 assists, Tavares 1G 1A, Willy 1G 1A).
Game 5 - Lost 3-0.
2021 Montreal
Game 6 - Lost 3-2 in OT (zero points for the Core 3 missing Tavares).
Game 7 - Lost 3-1 (Nylander 1G, Matty 1A).
2022 TB (lost two straight close out games)
Game 6 - Lost 4-3 in OT (Tavares 2G, Willy 2A, Matty 1G).
Game 7 - Lost 2-1 (Marner/Matthews 1A).
2023 TB first round win
Game 5 - Lost 4-2 (Tavares 2A, Matty 1G, Marner 1A)
Game 6 - Won 2-1 (Tavares 1G, Matty 1G)
2023 Fla second round loss
Game 4 - Won 2-1 (Marner 1G and 1A, Nylander 1G)
Game 5 - Lost 3-2 (Nylander 1G, Tavares 1A)
2024 Boston first round loss
Game 6 - Won 2-1 (Nylander 2G - Matthews didn't play)
Game 7 - Lost 2-1 (Nylander 1G, Matthews 1G)
2025 Ottawa first round win
Game 5 - Lost 4-0
Game 6 - Won 4-3 (Nylander 2G 1A, Matthews 1G, Marner 1A)
2025 Florida second round loss
Game 6 - Won 2-0 (Matthews 1G, Marner 1A)
Game 7 - Lost 6-1 (nothing for core 4)
Looking back, I almost forgot about some of this heartbreak. We came back from 3-1 against Boston to lose in Game 7 OT. The Florida series in 2023 was insanely close every single game, for all the nonsense talk about how Florida crushed us 4-1 in the series. But anyway.
I can't bring myself to go back and see how many games the core 4 missed over the years, like Tavares not being there in the beginning series and missing the full Montreal series, and then Matty and Nylander alternating in and out last year against Boston.
But in terms of just their totals in the final two games of each series, without knowing games played:
Nylander 10G 7A 17 PTS
Matthews 10G 4A 14 PTS
Marner 2G 11A 13 PTS
Tavares 7G 2A 9 PTS
There were a total of 22 games above, though Tavares missed at least 6 of them I think, and Matthews and Nylander missed some too.
Actually all better than I expected given that it feels like they've never done anything in those elimination games, but still not good enough obviously when our record in those 22 games is 7-15.
Now just looking at the final games (total of 11 possible, our record being 2-9).
Nylander - 5G 2A 7 PTS
Matthews - 4G 2A 6 PTS
Marner - 0G 4A 4 PTS
Tavares - 2G 1A 3 PTS
Obviously nobody is good enough, given their regular season performances and talents.