Unless they plan on playing rookies together and/or someone on the wrong side next season, there's just too many LD: Fowler, Mintyukov, LaCombe, Zellweger, Vaakanainen.
IMO, long-term, the Ducks are probably looking at Zellweger and Mintyukov. Fowler wouldn't be long-term for obvious reasons. LaCombe will probably end up better than Vaakanainen over the course of their careers. However, if the Ducks believe Zellweger and Mintyukov are better than LaCombe, the question is who is better on the bottom pair? Vaakanainen seems more suited for that role IMO.
If the Ducks look to trade for a good scoring winger or RD this summer, I wouldn't be surprised if he was part of a package.