From an Alembic perspective, I think BrownMark is worthy of a signature bass (if this is still an Alembic practice...) and here's why:
BrownMark's playing Alembic Spoilers are iconic as anybody with such honor, and yet he was seen around the world live more than anyone, many times over with the mega star artist (known as Prince...).
What bass maker wouldn't be happy, or feel a sense of honor for proven results, as picky as Prince is about the bass sound?
Therefore, if anyone I would think should deserve a signature, BrownMark would get my vote hands down for with his beloved support for the Alembic Spoiler.
Peace and Love,
Hal-