I think we all undervalue Rantanen a bit, but he also has some frustrating aspects to his game. If it were at all possibly to acquire some future assets in a trade for him, and sign Guentzel to a long term deal at a comparable number ($8.5m-9.0m) that would be a lateral move which would save money moving forward. Hopefully acquire a top-10/12 pick. I'd then trade Manson, re-sign Walker and your top-6/top-9 is pretty much set.
Drouin - MacKinnon - Guentzel
Landeskog - Mittelstadt - Lehkonen
Wood/x - Colton - LOC
x/Wood - x - Kovalenko
Toews - Makar
Girard - Walker
x - Malinski
At that point you'd have roughly $6mil I'd imagine to fill those remaining three spots.