O'Shea, 46, has been expected to take the position since the Dolphins settled on Flores as their new head coach. He served as Bill Belichick's wide receivers coach since 2009.
O'Shea said of his philosophy, per Adam Beasley of the Miami Herald:
"I truly still believe in the player. I think that you can have a system in place, but if you don't have the right players to fit within that system, the system isn't going to work. I think it's important to identify what your players that you have available to you do best and to try to build the system around what those players do."
The Dolphins are expected to undergo some level of organizational upheaval in 2019. ESPN's Adam Schefter reported the Dolphins plan to rebuild during the 2019 season, with an eye toward taking a quarterback at the top of the 2020 draft.
That would require some patience from two coaches very accustomed to winning in New England. Flores is fresh off being the play-caller for a Patriots defense that held the Los Angeles Rams to just three points in Super Bowl LIII. Flores has never coached a team with a losing record; O'Shea hasn't been part of a losing campaign since 2006.
"We're going to look to really build this organization based on our needs," owner Stephen Ross told reporters, "and if it takes a year or so—two years, three years—we are going to be there."
O'Shea, a Houston native who played at UH, will inherit an offense that's expected to move on from quarterback Ryan Tannehill and had 35-year-old Frank Gore as its leading rusher.