Difference is before Couts got top wingers and put up points, he had elite metrics for two years, and advanced metrics are primarily predictive, not descriptive.
Ghost has improved his metrics, but he's not an elite defenseman, neither is Provorov yet, but he has that kind of upside, Ghost doesn't.
The closest comparable to Ghost is Mark Streit, don't think so, same size and similar skills (Streit came over from Switzerland at age 28). And no one has ever suggested that Streit was an elite defenseman, Streit had seasons of 62, 48, 46, 44 points.
From 30-37 (prorating the strike year) averaged: ES 5-21 PP 6-20, Total 11-41 52
Streit finished 8th, 10th and 13th in Norris voting.
Ghost his first four years (prorating his rookie year and this year): ES 7-18, PP 6-19, Total 13-37 50
Here's the crazy thing, we got Streit at age 36 for a 4th rd pick, gave us seasons of 44 and 52 points before he started breaking down at age 38, at which time we traded him for a 4th and 7th rd pick and Filppula's contract.