You don't usually hear this in hockey, but we have too many high quality centers. Krejci, Bergeron, Yeti, Spoons, Koko... on some teams in the league, Spooner and Koko are 3rd/4th line centers as is.
I think the whole Seguin ordeal has influenced the decisions regarding these 2 guys. We forced Seguin into a wing role and he performed well, at times, but we severely limited his potential. Spooner and Koko are good but they're not Seguin-level players, so the organization probably assumes they won't perform very well at the wing role.
We also have to remember why we've got Soupy out there. He's not meant to rake in the points, he's out there to be a grinder and to win face-offs and he performs his job well.
Here's what I see happening. If Koko has a good season (which he almost certainly will), at some point we will see Soderberg and Spooner traded in a package deal for a quality winger or D-man. I know none of us want to see the Yeti go but I don't know how we're supposed to afford his contract next season... he can probably get $5million or more on the market right now. Then we'll see Koko promoted to third line center... I know that kind of sucks to hear, but it's the smartest move to make.