Maybe, but then you’re going the other way and exaggerating the differences. How was Chara a top pair defenseman for 20 years? His first season that can be argued as a top pairing guy was his first in Ottawa at 24. You say his age 41 season in Boston he was still top pair. That would be 17 seasons considering the lockout. So 2 more than Leetch.
And Leech was top 5 in Norris voting 7 times, yet you’re giving him credit for only 6 years as a Norris contender. I get you’re trying to put together a consistent prime, and one of those years was a few years off, but then even those 6 surround a season he missed games but was still a Norris level player. And if you want to dismiss that year or the top 5 Norris, then Chara also wasn’t as good in his first year with the Bruins either. At best you can argue he was at that level for 3 more years.
I also think Leetch was also closer to a Norris level player in his top pairing years outside of those Norris voting years, which is born out in Norris voting.
All told, if Chara was a Norris level player for a couple more years, then they were top pairing players outside of those seasons for roughly the same amount of time, and if Leetch was better in both of those instances, I consider him the better player. My post suggested that their time periods as top pairing guys was similar (ie within a couple of seasons), which it clearly was.