If any of the big pending FA'S don't re-sign with their teams, you have to think Verbeek will make a push for one. That includes Marner. Ducks forwards are currently:
Killorn Carlsson Leason
Gauthier McTavish Fabbri
Vatrano Strome Terry
Zegras will take Leason's spot when he's back, but Vatrano and Fabbri are FA after the season. If Ducks can land one of the big FA (Rantanen or Marner) and move Fabbri and Vatrano, that looks a lot better.
Zegras Carlsson FA
Gauthier McTavish Colangelo
Killorn Strome Terry
Also gives Sennecke proper time to develop then Ducks can decide who to move in 3 or 4 years if necessary. Cap shouldn't be an issue, none of the kids have proven anything (outside of Terry who has a long term contract), and Strome, Killorn, and Gibson fall off in the next few years along with Gudas, Trouba, and the retention on Fowler.