You're grotesquely under rating Virtanens value if you think Erikssons negative cap hit is a difference of that factor. You're asking for what we consider two first round picks. If that's the cost for New Jersey to do business, then I hope they enjoy themselves watching other teams acquire assets they could have had.
And IMO you grotesquely under rating the negativitiy of Eriksson's contract. I already stated that I don't think that Virtanen is worth a first round pick. Here we can agree to disagree.
Where I really think people underrate the negative value of cap dump contracts, is for contracts running more than one year. Let's take the Seabrook contract (sorry Chicago fans), who runs another 4 years at a cap hit of 6.875m. Dollars paid is less, but for this point it actually doesn't matter. Let's assume there is another Seabrook out there signed to the same amount but only for 1 year. In a cap dump trade his value is a theoretical -1. You can associate to it, whatever you like e.g. a Top10 protected first like in the Marleau trade. If you want to dump now 4 years of the same contract, the equivallent is not 4 times -1, it's more. A lot more.
Here is why? The first year a team can take up with a more or less clear picture of the teams situation. You can quite easily evaluate, if the contract has any negative impact on what you are able to do, during the duration of the contract. For the second year the teams outlook could change. A Marino like pick up for cheap, a breack out year from a young player talented player a la Draisaitl 18/19 or the resurgence of a struggling player. So the second year carries more risk for the team acquiring the cap dump and the risk should be compensated accordingly. Let's add 20%-30% and the value -1.2 to -1.3. Same game for year 3 and 4, where we assign -1.4/-1.6 and -1.6/-1.9 of value to the cap dump. For four years the Seabrook contract accumulates -5.5 (between - 5.2 and -5.8) times the negative value of a year cap dump of the same magnitude.
In my valuations the RFA rights of Virtanen cover the first year of Eriksson. Virtanen comes with no contract and cap hit and my team might struggle to sign him for a contract, which I consider fair. As explained above the second year of Eriksson is more expensive and is covered by the lottery protected first. If you don't like it, try to deal with someone else. But if you return to the negotiation table I know you are on the hook and it will only get more expensive for you.