Considering:
a) Black becomes stronger and stronger after every hit or fight (zenkai power?) and because of this he was able to transform in Super Saiyan Rosé...

b) Black has Goku's body and can use all of his techniques, like Kame Hame Ha or the teleport...

c) One can presume (by what we saw in DBZ) SSJ3 is a transformation that can only be achieved in other dimension, like Goku in Kaio's realm or Gotenks in the RoSaT, and Black can time travel and stuff...

d) All important villains in DBZ had at least three different transformations...

Also...
- This Future Trunks arc is been a little bit of a "crowd pleaser" in terms of storytelling and characters...
- Black could/will be an iconic character for Super in terms of selling toys and cards, so it makes sense to give him another form...
Is it possible that we can have this villain achieving that iconic and fan-favourite transformation?











