This is silly talk. A new team gives you a magic reset button. It means you revert to prospect status and all your previous potential has the ability to be realized again.
Kidding aside, I wouldn't be surprised if Risto looks better than he did in Buffalo. He's going to have a much better team around him (as a whole) and play with a much better defenseman than he's played with previously. Quality of teammates is immensely important and he'll get an upgrade in that department.
That said, anyone expecting him to come in and magically become a top pair d man (and make no mistake, that's the price we paid), is blindly wishing. I don't want Risto to fail, but having the mindset that he's going to come in and suddenly become what he was supposed to be is setting yourself up for failure. We have 8 years of data to guide us to this decision. We don't need to rely on blind faith and hope.
Well, we overpaid, but not sure we overpaid by as much as presumed.
2nd pair D-men as rentals cost a 2nd and 3rd for 0ver 30 players with no upside and significant downside.
A gamble like Subban with salary to boot (a negative given his age and health) cost (2) 2nds.
If the Flyers concluded that the draft was so bad that #13 was more like #23 in most drafts, then they overpaid, but not by a huge margin. For one thing, there are no longer conditional picks where you can give a 2nd that becomes a 1st if you resign the player. So they gave up the equivalent in their eyes of a late first rd pick rather than a second 2nd rd pick.
The 2nd paid to dump Ghost is irrelevant, b/c that was the price, they had tried to dump him for a year. As other deals showed, that was the going rate. That cap room was going to be used, whether for Risto or other players.
Now if you expect Risto to be a first pair D-man, you're likely to be disappointed.
If you hope Risto is an upgrade over Myers/Braun as the 2nd pair D-man, you have a better shot at happiness.
I'll withhold judgement for now, and see how he performs with his new team.