The Sharks would want more, but that doesn't mean we should be giving it to them. We are still too far away from being contenders to make a move like that, especially considering the likelihood Erik regresses a lot in the near future.
The only thing I was saying in my post was that the Sharks would probably expect a good return. The desired assets in a rebuild are typically draft picks, prospects, or good, young players. I say this because there doesn't seem to be as much focus on that element, or that some of the focus seems to be on the other team (Sharks in this case) saving money.
As far as whether that's a good move or not for the Senators, I didn't say anything about that.
Matching the age of our existing core would be one thing to bear in mind and look for in a trade imho.
The other thing would be doing an alternative analysis and looking at other alternatives. It could be that we just need a good partner & complimentary player to play with Sanderson. Of course, this assumes Zub will be paired with Chabot. That could end up being a much cheaper alternative in terms of both the player salary that needs to be paid, as well as the assets it takes to land the defender.
But ostensibly, this topic has been beaten to death and I doubt if anything I say will have any impact or change anybody's mind. People have hardened positions that rarely change when it comes to this kind of thing (and many others).