Check the PP numbers again.
What you say is true in 1986-87 and 1987-88.
But Sutter was amongst the top 3 forwards on his team in PGF in the other 7 of 9 seasons from 1984-1993. In other words, he was pretty clearly a first-unit guy for the better part of a decade.
Certainly. I am not saying he was not ever playing on the PP, but between 1981 and 1988, he was on the second PP unit, not the first, and thus was playing with the lesser PP puck moving defensemen/Quarterbacks and not with the top forwards(Excluding the 85 year when he replced Trottier on the first line.
In the meantime, the more pressing matter would be his lack of offensive linemates while 5 on 5. He was never a 1st line player save that one year. Mere misfortune that the team had 2 great centers in front of him at all times, but Brian did not have that problem, as he was usually on the first line with Federko.
Brent's numbers as a 3rd line center(Behind trottier/Bourne) were in the 40-50 point area. After Bourne was gone and he moved to 2nd line duties with more offensive uptime(Yet still used in a checking role) his numbers were more regularly around 60-65 points. One would assume given 1st line offensive duties more often with the better forwards like Brian had in Federko that it may jump his point total up 5-10 points into numbers similar to Brian's.
Defensively I would agree they are very close.
As for the PIM stuff - well, Brian took a lot of fighting majors. Generally, with players like Neely/Shanahan/Tkachuk/Roberts, that sort of play is considered an asset, but I agree that it isn't really here nor there. He was considered a great leader for more than just his PIM totals, though.
Brian started killing penalties regularly when he was 26 and was good enough at it that he finished 6th in Selke voting in 1985. Unfortunately, his career was ruined by injuries after that point. If he played until the age of 35 like his brother did, he would have been a prime PK guy for much longer. It's also worth noting that star players in the late '70s/early '80s rarely killed penalties. That trend changed when Gretzky etc. started piling up the SHG. Even a guy like Trottier was only a regular PK guy in 2 of his first 8 NHL seasons.
Its really a "what if" situaton.
Brian never started killing Penalties until 83-84. According to the Data, the only years he was a steady penalty killer was 83-84, 84-85, and his final year 87-88. In every other year in his 12 year career, he was not a penalty Killer.
If they used him in more of a 2nd/3rd line and PK role with the lesser linemates like the Isles did with Brent, then it is feasible that his numbers would drop by 5-10 points a season.
Injuries are sad and all. But them's the breaks. When it comes right down to it, Brent was effective at what he did for 11 years or so. Brian was effective at what he did for 7 years. Their peaks are close in my book, so the longevity edge pushes Brent over him by a tad.
Again, Brian was one of the best all-around players in the sport in the early-mid 1980s and was 6th in Hart voting in 1985. And I'd take him over Brent in their primes for the same reasons I'd take Gary Roberts over Mike Peca in their primes.
Ill go a bit off topic here in my response.
Hart voting 6th overall is very arbitrary. By 6th overall, you can say "6th overall in voting" or you can say he received 5 votes out of 61. The fact that he received a 1st place vote to begin with has me skeptical that the 3 Blues journalists were not being unbiased. Gretzky did score 73 goals and 208 points after all, and the only 1st place voter he did not receive was that one.
This came up the other day in fact(About a different player), but if you did not get at least 10 Hart votes out of 61, then I don't consider it to be very telling. Modern voting is much more telling because you have hundreds of voters instead of simply 3 from each city, and 5th place votes instead of stopping at 3rd