There is zero reason to think a 32 year old player is somehow going to do something he has never done in his career. What are you talking about with Thornton, Marleau and Pavelski? Thornton's best seasons in his 20s completely smokes his best season in his 30s, he put up 125 points at age 26 and his highest point total in his 30s was 89 (at age 30).
Damn Mark Stone is playing at a 150 point pace right now, I guess he's the best player in hockey.
It's a 9 game sample size. Teams aren't going to see "wow he has 10 points in 9 games this year, I guess he's a 90 point player now". They'll look at him and say "oh, Mikael Granlund is still the same exact player he has been his entire career".
Joe Thornton's best season was at age 36 where he was 4th in the NHL in scoring AND played elite defense. Try era-adjusting scoring.
I don't know what your beef is with Granlund but I genuinely don't know why you're so invested here. He's playing excellent hockey in all three zones in all situations right now and would improve any contender. Obviously people aren't going to think that Granlund is a superstar, because if they did, then everyone would be lining up to trade for him. But he's going to be by far the best center available at the trade deadline, and that's what this thread is about.
The crux of what you're missing here, is that Granlund as a "1st liner" he needs to produce like that, isn't a team going anywhere. No "contender" is going to want him on their 1st line because he's not good enough for that, and production just isn't always linearly scalable like that. So 2C Granlund is going to score at a significantly lesser rate, while also not bringing a lot of anything else to the table.
No, the crux of the issue is that Granlund is literally the only player who is not a problem on the Sharks right now. I would be more than happy to keep giving him 1st line minutes if the rest of our team was even a little decent, because he deserves it.
If you think he doesn't bring anything but scoring, then you just haven't watched him as a Shark. He's on the PK, he's soaking up hard defensive minutes, and he's showed immense leadership value.