No way they're going to replace Hughes this year, his dead cap hit is $10,850,000. Looking at Hughe's cap numbers, he most likely is ours through 2021 and is a UFA in 2022. You would replace Murphy, whose dead cap hit this year is $1,750,000.
I agree that Shaq is not a top DE/edge and if he wants more than $9-10M AAV, I think he walks. I also agree with you that I think Beane will end up buying a top tier DE/edge in FA.