... rather than just going like, 'OK, as of now, everyone is relevant because I say so'?
Here is what could have happened...
-Piccolo fuses with more Nameks.
-Gohan transforms into SSJ Blue (or at least SSJ God).
-Tenshinhan devises a new version of Kaioken. Krillin uses it too.
-Eighteen and Seventeen get mechanical upgrades from Bulma.
-Roshi finds something the 'elixir of immortality' and becomes stronger by drinking it.
Here is what could have happened...
-Piccolo fuses with more Nameks.
-Gohan transforms into SSJ Blue (or at least SSJ God).
-Tenshinhan devises a new version of Kaioken. Krillin uses it too.
-Eighteen and Seventeen get mechanical upgrades from Bulma.
-Roshi finds something the 'elixir of immortality' and becomes stronger by drinking it.