I used MS Excel to give me an answer. I had to get rid of seasons where a player was traded mid-season, and I also had some trouble if two players tied for the lead in a certain category. I had some trouble in Excel for this one, so please let me know if you see any errors.
Leading Team in Points
1 Wayne Gretzky 18
2 Gordie Howe 17
3 Dale Hawerchuk 12
3 Marcel Dionne 12
3 Steve Yzerman 12
6 Gil Perreault 11
6 Mario Lemieux 11
8 Joe Sakic 10
8 Mats Sundin 10
8 Mike Modano 10
8 Phil Esposito 10
12 Andy Bathgate 9
12 Bernie Federko 9
12 Stan Mikita 9
15 Alexei Yashin 8
15 Bobby Clarke 8
15 Brett Hull 8
15 Cy Denneny 8
15 Guy Lafleur 8
15 Jaromir Jagr 8
15 Jeremy Roenick 8
I was quite surprised to see Alexei Yashin come in the top twenty, especially since everyone else on this list is, at the very least, a Hall of Fame candidate.
Leading Team in Goals
1 Gordie Howe 15
2 Bobby Hull 11
2 Brett Hull 11
2 Phil Esposito 11
5 Mario Lemieux 10
5 Mike Bossy 10
7 Mike Gartner 9
8 Cam Neely 8
8 Cy Denneny 8
8 Dale Hawerchuk 8
8 Dino Ciccarelli 8
8 Joe Sakic 8
8 Luc Robitaille 8
8 Mats Sundin 8
8 Nels Stewart 8
8 Peter Bondra 8
8 Wayne Gretzky 8
18 Alexei Yashin 7
18 Frank Mahovlich 7
18 Garry Unger 7
18 Howie Morenz 7
18 Jeremy Roenick 7
18 John Ogrodnick 7
18 Keith Tkachuk 7
18 Marcel Dionne 7
18 Maurice Richard 7
18 Pavel Bure 7
18 Zigmund Palffy 7
Bossy is a perfect 10-for-10. Nice to see the Hulls come in second place: like father, like son.
Leading Team in Assists
1 Wayne Gretzky 18
2 Gordie Howe 15
3 Ron Francis 13
4 Marcel Dionne 12
4 Stan Mikita 12
6 Mario Lemieux 11
7 Adam Oates 10
7 Bernie Federko 10
7 Bobby Clarke 10
7 Dale Hawerchuk 10
7 Steve Yzerman 10
12 Andy Bathgate 9
12 Frank Boucher 9
12 Gil Perreault 9
12 Joe Sakic 9
12 Mats Sundin 9
12 Peter Stastny 9
12 Vincent Damphousse 9
19 Denis Savard 8
19 Doug Weight 8
19 Guy Lafleur 8
19 Mike Modano 8
Geez, another list where Gretzky's the best playmaker. This is getting boring...
Defenseman Leading Team in Points
1 Ray Bourque 5
2 Denis Potvin 4
3 Bobby Orr 2
3 Brian Leetch 2
3 Phil Housley 2
6 Bill Gadsby 1
6 Brad Park 1
6 Chris Chelios 1
6 Dick Tarnstrom 1
6 Dmitri Mironov 1
6 Kevin Hatcher 1
6 Larry Murphy 1
6 Norm Maciver 1
6 Paul Coffey 1
6 Paul Reinhart 1
6 Reijo Ruotsalainen 1
6 Scott Stevens 1
6 Sergei Zubov 1
6 Sprague Cleghorn 1
As you can see, only five defensemen have ever led their team in scoring more than once. This would be pretty good ammo for the Housley deserves to be in the HOF debate.
Very, very strange to see Dick Tarnstrom tied with Paul Coffey on a list of best offensive defensemen!