I don't think bringing in a brand new OC that has a different scheme that would entail a large re-training of the staff and players is a recipe for success in 2021. Frost has been instilling a system for 3 years and has an OC he seems to trust to take on most of the play calling duties. The games in which Lubick called last season were pretty encouraging. 2020 had a myriad of issues that I think everyone seems to overlook. The Offense was trying to rebuild to a large extent with a new coordinator, new roles for other coaches, Austin taking over as Run Game coordinator for instance, lots of new players, especially at WR, to get coached up on the system, yet they didn't get the standard off season practices to allow for the needed growth. Lubick was a new hire brought in just before a pandemic hit, Spring Ball got cut way short and the pre-season camp wasn't normal either; he was asked to analyze what is wrong with the offense, get an entire offensive staff on the same page with him on the needed changes and foster the needed staff chemistry despite all of the changes. He didn't get the normal development time with the players, with WR cupboard that was bare of experienced talent at WR except for Wandale; they were relying on a talented crop of incoming RAW players to bolster the WR position. Compare all of that to what was the situation for the D, Chin had an experienced staff that were all on the same page, had coached the system together for many years, and a litany of experienced talent to work with. Is it any wonder that the D was better than the O this past season. I was encouraged by the growth I saw out of the O over the latter part of the season, it seemed clear to me that things were starting to click for the players and staff.
At some point assistant coaching stability is needed for true growth, especially at the coordinator position. If you are truly putting Frost on a 24 month clock, changing up coaches AGAIN isn't the answer IMO. Give Frost and Lubick a chance to build on the growth made through the 2020 season with an offseason in which they should get a full set of Spring and Summer practices.