Board Thread:Fun and Games/@comment-27996636-20170814181056/@comment-28063230-20170817015249

NegativeSymptom wrote: What I don't understand is both in the anime and the Manga SSB is stated to drain stamina heavily whenever you transform into it, or takes a lot of stamina to transform into, which is the reason Vegeta lost to Hit, yet Vegita goes in and out of SSB when fighting black and hes completely fine. I can explain that easily.

The "SSB form drains lots of stamina" comes directly from Toriyama, that's why it's in both versions.

Yet, Toei in their infinite ineptitude ignore that piece of info an episode after mention it, creating the inconsistency.

As if it wasn't enough, they make Goku use Kaio-Ken on SSB, worsening the contradiction.

Vegeta could use the SSB form on multiple occasions against Goku Black due to special training with the SSG form.

In other words, its not your fault that you do not understand, your confusion comes from Toei's awful writing.