Isn't Fiala doing better than Granlund? As well as having a better contract? Seems like a poor example.
The issue isn't how good Brodin is. Contract length is part of the equation as is the upcoming expansion draft.
I'll never say never, but I'll be quite surprised if Carolina trade Necas even straight up for Brodin, much less adding picks or other prospects. Yes, Necas isn't as proven, but he also is also developing very well, showing incredible skill, is still on an ELC, is exempt from the expansion draft and under team control for another 6-7 years. Brodin is a UFA in 1.5 years and even if he signed an extension before that (not likely), he would then need to be protected, along with Slavin, Pesce, Hamilton (assuming they sign him to an extension), and Bean also. Then there's Aho, Teravainen, Staal, Svechnikov, Foegele, Wallmark, and a host of other forwards.
If that's the asking price, I hope the Canes pass, like they did a couple years ago when the Duchene asking price was too high. If the Wild gets a better offer from someone else, that's fine. Teams talk all the time and only a small % of them probably ever come to fruition.