I like Darnell, but I'm not going overvalue him because he was relied upon too heavily during the "dark" years. Realistically, he is a top-4 D who has already been passed offensively by Bear.
Yup. But I think that is the reason for the impasse.
Some interesting decisions to be made on the left side. Let us say you sign Darnell to an 8 year extension.
You have Darnell signed until 2028 (or thereabouts) (he will be 32 when the contract ends).
You have Klef already signed until 2023.
You have pending LHD in Broberg, Samorukov, Lagesson, and Jones. I imagine one of these eventually takes the third LHD spot (this does not even count any new LHD drafted by the Oilers over the next few years).
Maybe Klef does not get resigned in 2023/2024. By the time Klef comes off the books, Bouchard and Broberg would be getting into their second contracts. So in 2023/2024, your LHD could be:
Nurse
Broberg
Jones, Lagesson, Samorukov, etc.
The right side would be Bear (depending), Bouchard, and who knows. I do not expect Larsson to be around in 2023/2024.
Will be interesting to see how things play out. Regardless, barring injury or trade, the defense seems set for the next 6-8 years.
EDIT: And if you can't sign Nurse long term and have to move him, you can get a bundle in return. He has high value.