Nikishin got plenty of play in our top 4 when most of the crew was hurt. I would hope that Nikishin wants to play more, you don't want players who are content to get lesser minutes.
Nikishin still put up enough stats that would get him $8 million per on a long term deal even as mostly a 3rd pair guy. Jalen Chatfield has one more season left on his contract and is 30 years old. He will be 31 at the end of the coming season. That is typically the situation where the Canes allow our Dmen to sign elsewhere for more money than we think their value is. So yeah, there will probably be a top 4 spot available after next season. But this coming season? No.
Ghost's is also on the final year of his deal. He will be 34, but his situation as a 3rd pair guy and #1 PP guy is different than Chatfield's, so he MIGHT be given another contract.