I have had many hockey related opinions that people didn't agree with(some times vehemently), but I never turned around and attempted to discredit their knowledge base for a conflicting opinion. It's clear you're personally not a fan of Buchnevich (and possibly Russian players?) but others have cited his age, production, and contract as being a reason why he would have more value than Saad in a trade - and then you want to throw in Reunanen on top of that?
You can think that people are undervaluing the real meat and potatoes of what drives playoff success (grit, forecheck, tenacity etc.) all you want, but any way you slice it, you would have to add to Saad to get Buchnevich, maybe not a crazy amount, but you would still have to add.
Oh, and I don't want Saad to get the short end of the stick here - I think he is a good defensive player who is simply a little older and just not currently worth as much as Buchnevich *insert shrug emoji*