The Leafs had much better goaltending and an infinitely higher payroll. They should have been capable of defending.
The gap closes, but it's still not particularly close when we cut it down to even strength goals and goals while on the PP against.
Period | Player | GP | G | A | Pts | GPG | PPG | EVGA | GA/GP |
1995-09 | Sundin | 1022 | 429 | 586 | 1015 | 0.42 | 0.99 | 751 | 0.73 |
1996-10 | Alfredsson | 1002 | 375 | 617 | 992 | 0.37 | 0.99 | 661 | 0.66 |
Career | Zetterberg | 1082 | 337 | 623 | 960 | 0.31 | 0.89 | 711 | 0.66 |
Their SH TOI is close from 1998 until the end of time period I chose. Even equalized for TOI, 31% more SH goals were scored while Sundin was killing penalties vs Alfredsson.
Sundin = 1:35 game (7.5 SHGA/60)
Alfredsson = 1:21 game (5.7 SHGA/60)
Every defensive stat is a proxy measure that doesn't directly measure defensive play, but it's a lot better than saying something like "I'm going to ignore all evidence and say that the guy I like is better".
All of the available evidence points to Alfredsson being significantly better than Sundin defensively.