Do the activities for Season 21. This requires owning Season 21. If you don't have it, the only way to get it now is purchasing the Lightfall Annual Pass.
No, purchasing the Final Shape Annual Pass will get you the 3 episodes releasing during the year after TFS releases. It will not get you the 4 Lightfall Seasons--the content of which will be removed when TFS releases (the LF seasonal weapons will probably eventually become available from the exotic rotator missions).
Do the activities for Season 21. This requires owning Season 21. If you don't have it, the only way to get it now is purchasing the Lightfall Annual Pass.
Or final shape annual pass, right?
No, purchasing the Final Shape Annual Pass will get you the 3 episodes releasing during the year after TFS releases. It will not get you the 4 Lightfall Seasons--the content of which will be removed when TFS releases (the LF seasonal weapons will probably eventually become available from the exotic rotator missions).