You're connecting a lot of dots that aren't dots. There was a lot more in place before Gillis arrived, Ehroff addition is not similar to Hronek (The canucks D already was good) Usually when a team improves, the PP does too. Everyone always feels it's time to rebuild when a team isn't doing well.
I don't see it whatsoever. This team needs more pieces.
Not directed at me but I disagree on some points. The pieces in place when Gillis took over weren’t established young pieces and the team was drafting 10th overall. Sedins were turning 28, Luongo was 29 and Edler and Kesler weren’t stars. But at the time it was only Luongo who was amongst the best in the league. There were veterans in place on D and the D was for sure a lot better. But the team needed more pieces. It’s worth mentioning that Gillis was trying to add younger pieces and didn’t think the team were contenders until he saw the Sedins and Kesler up for awards.
Current management took over a team with younger stars in Petey, Hughes, and Demko with Miller being 29 and Horvat being 27. They also had Boeser and signed Kuzmenko with Pods and Hoglander in the lineup with the 15th overall pick. Even saying this I am not sure that the timeline was all that different. Most of us thought we should ride things out and compete when Dickinson and Myers’ contract are gone. Buying out OEL then would also be cheaper. Maybe we would have traded Miller for futures and kept Horvat at around $7M AAV.
As for Ehrhoff, that was a home run trade and he boosted the PP. Hronek doesn’t boost the PP the same way because we have Hughes but there’s a comparatively bigger need for a top 4 Dman. Regardless the trade isn’t comparable not for the reasons you stated. A rebuilding team wouldn’t regret making the Ehrhoff trade but not necessarily the Hronek trade.
There also isn’t exactly a direct correlation in terms of how good a team is vs their PP. The Oilers had the best PP last year. Canucks finished 11th in the league last year in PP%. Senators and Sabres were even better. 3 out for the top 11 PP teams missed the playoffs. Hornek doesn’t even play on the top unit.