For those doubting what I said above, here's the Norris record of a few defensemen during their Montreal years:
Harvey: 1, 1, 1, 1, 1, 1, 2, 2*, 2*, 4
Robinson: 1, 1, 2, 3, 3, 3, 4, 5
Lapointe: 2, 3, 4, 4, 5, 5
Savard: 4, 5, 5, 5
Laperrière: 1, 2, 4, 4, 5, 5, 8
JC Tremblay: 2, 3, 4, 5, 5
Chelios: 1, 6, 8
Markov: 6, 6
Subban: 1, 3
Langway: 5, 9
Weber: 6 and whatever he gets this year
*Harvey voted 2nd in AST voting (so 1st AST) behind Red Kelly before the Norris Trophy was introduced.
For pre-Norris era defensemen, Butch Bouchard was voted 1st AST three times (so 1st or 2nd), and 2nd AST once (so 3rd or 4th) (too lazy to verify which it was, but the data exists in the HoH section). OTOH, he did this during the war years during and after WWII.
Tremblay's Norris record is good but his competition was weaker - same for Laperrière. In comparison, it 's obvious Serge Savard's quiet defensive style hurt him in Norris voting, and on top of that he had to fight against Salming, Potvin, Robinson, Lapointe and Park for Norris votes; insane competition. In the playoffs Savard was golden. Does anyone doubt he was better than both Laperrière and Tremblay anyway? And does anyone doubt Laperrière was a better defenseman than Tremblay?
So yeah, then you have Ken Reardon, Sylvio Mantha, Butch Bouchard and a few others who can compete against Tremblay for the #6 spot.