You, like most who make this argument, are trying to tie number of sacks into some sort of predictive scale. As in he has 8 sacks, so he's worth x, and he has 6 sacks, so he's worth .75x.
It just isn't anywhere near that exact of a science.
Each player has other attributes. Christian Wilkins leads the league in Tackles from his position. He is the Dolphins stated emotional leader (ask any of them)... while you stick to your sliding scale analysis of him being worth .75x based only on sacks.
I think you are not only wrong, but dead wrong... and I suspect (but can't prove) the team agrees with me... or more like, I agree with them.
I guess we'll see, but... prepare to be disappointed.