You are very funny! Kahun was use in a top 6 role last year in Chicago mostly with Toews and didn’t managed to get 40 point so calm down with your 50 point forward. Kahun is in the same category then Lehkonen maybe a bit better but certainly not a top 6 players. You have seen him play how many game this year. The only thing you keep saying is how point he produced bla bla bla but i am pretty sure you didn’t watch any game because you don’t know anything about Lehkonen. The only thing you know is from internet and stats site, that make it even more funnier. And probably you didn’t watch any Pittsburgh or Sabres game either because he was use mostly with on the their line in Buffalo with Larsson and Johanssen. In Pittsburgh he have played with Malkin for a while but mostly on the third line with Mccann.
It appears that you get angry any time you hear something you don't like. Let's have a chill conversation instead?
Kahun did play top six in chicago, where he got just shy of 40 points. However, that was also his first year in North America. To jump onto NA ice and perform that well straight away is impressive. He was also 22 that year.
The trade was largely considered as a swap of a top six forward for a top 4 defenseman. Kahun was on the path to become a defined top 6 forward. On PIT he wasn't, mostly because of how strong they already are on the wings.
Now on BUF, he is to be used on the top 6 again. His sample size is small, but he has done well there. There was a noticeable energy on the line he played on in the first few games on the team. The line you mentioned (Larsson and Johansson) was their 2nd line. MarJo is the 2C, and Larsson hasn't been awful. Larsson wasn't there that long though, Olofsson appears to have finished the season on that line.
Every team has their fan favorites. Sure, he might be a good defensive forward, my point is that Lehkonen isn't becoming what he was supposed to be. Habs fans appear to want this kings ransom for him in trades, when really he can bring in another middle six or bottom six foward. Anderson as a return isn't that bad. But it's also realistic. The general thing is, most teams have a guy in their bottom six who is good defensively, but that doesn't mean their trade value is through the roof. For instance, Cogliano on Dallas essentially plays the same role as Lehkonen right now, but he wouldn't be moved for much. Similar with Andrew Copp on WPG (who is probably a better example).
Where I will give you that I don't watch all games, I try my best to watch the 8 minute highlights for a variety of teams after games. There's a pretty alright sense of what a player can do from that.