It's not saying much, but Grier is definitely a step up from both Tannenbaum, Ireland, Hickey, and possibly Mueller.
Chris Grier, Dolphins https://www.rotoworld.com/article/goal- ... 019?page=2
Technically the Dolphins’ general manager since 2016, Chris Grier is functionally a new hire. His title was in name only until Adam Gase was fired and EVP Mike Tannenbaum was “reassigned.” Although he finally has the power, Grier has been tasked with the most thankless of jobs: A top-to-bottom rebuild. He will be doing so under famously impatient owner Stephen Ross, who let Tannenbaum talk him into one half-baked “reload” after another. Ross is one year shy of becoming an octogenarian, but he has insisted he will give Grier the time and space needed to remold one of the league’s least-talented rosters. Although it is far too early to grade the results, Grier’s early process has been promising. In free agency, Grier checked all his tanking boxes, cutting deadweight veterans like Danny Amendola, Andre Branch and Ted Larsen while unloading Ryan Tannehill and Robert Quinn via trade. Grier was methodical in his head-coaching search. Whereas every other team hired the first Sean McVay disciple it could find, Grier took his time and settled on Bill Belichick acolyte Brian Flores. Grier has paired his rookie head coach with a textbook rebuilding tandem of Ryan Fitzpatrick and Josh Rosen at quarterback. 2019 will be long, but 2020 could already be the beginning of a turnaround if Rosen makes the most of his second chance. Grier will only go as far as his aging owner and young quarterback allow, but his road to relevance has thus far been paved with sound decisions.