Since football began, offensive line play has been at the core of every championship team -- control the clock, keep your defense off the field, and run the plays you want to WHEN you want to! And it never seemed to matter if the formation was pro-set, shotgun, run-and-shoot, or even the wishbone, if my big guys whip your big guys, I'm probably gonna win!
It normally takes 2-3 years for an offensive line to develop -- imagine orchestrating the movements of five 300 lb. bodies in unison. The continuity of the offensive line is a must!
Dallas must limit any change in the offensive line to one player. If Flozelle goes, Kosier must stay at LG and break in McQuistan or Free at LT. However, if Flozelle stays, the team could have open competition at LG between McQuistan and Marten (brawler type), as Free is the future LT. Kosier has played every position on the OL during his career, making an excellent swing man backup.
Dallas cannot draft Flozelle's replacement at LT; therefore, any other replacement (Davis, Columbo) would require a move from another position, further weakening the unit.
At what cost? Start with a 3 year, $20MM deal, guarantee $10MM, and let the negotiations (and your blogs) begin.