Where are you getting that 5.5 million in cap space left?
His numbers are wrong, nevermind the source.
As per capfriendly, the Ducks have 7,520,833$ left to fill-out their roster, with assuredly two, possibly three players to add to their already accounted-for 20 players at the NHL level under contract currently.
Let's say Rakell ends up signing a bridge deal of two years for about 2.5-2.75M$, as is quite possible given his close-ish comparables (Elias Lindholm, Galchenyuk, Yakupov, etc.), lack of arbitration privileges and limited playing options outside of Europe. That leaves about 5 millions to sign Lindholm and the 23rd man, which isn't really a lot if Lindholm doesn't also take on a bridge deal and given that most GMs tend to want to leave at least about 200-300K of capspace for contigencies, injury call-ups and the 15-day period before LTIR activates.
Of course, in that scenario the Ducks' GM could then sign Lindholm to a semi-bridge deal at about 4-4.5M$ for about three years (ala Ryan Johansen) and go commando like the Sharks did earlier in the decade, trudging along recklessly with only a 22-man roster and about 500K-1M of capspace for emergencies.
So, all-in-all, the Ducks are in an okay-ish position going forward with their roster despite potential problems if either or both of their two RFAs hold out. In the same vein, the Duck's management staff could avert having to move some of their more highly-paid players around if circumstances develop in a favorable and reasonable fashion for them, meaning that all these Lindholm, Fowler and Rakell trade threads could (and probably will) end up being only asinine speculation spawned forth by hockey-crazy fans debating half-dead points to the obliteration of logic itself while ceaselessly staring at the unblinking void that is HFBoards and the internet itself.
Anyways, have a nice night everyone.