Not saying Whitworth should ever be on the list of all-time Rams OL. That list is too long and includes many, many long-timers.
But at this point I think he can absolutely be considered a "Rams OL" even with 11 years in CIN. He could end 2021 with as many as 73 regular season starts for the Rams (80+ including postseason). That's more games than Eric Dickerson played as a Ram. I compare Whitworth somewhat to Aeneas Williams. Obviously much more of a Cardinal but by all means can he also be considered a Ram.
Whitworth is no longer a rental or short-timer.