When a Sett Brawler that has buffed itself to 8 might is saved from death by The Boss's replacement effect, does it retain its 8 might or reset to 4?

Ruling: The Sett Brawler retains its 8 might when saved by The Boss's effect because the unit never leaves the board zone and remains the same game object.

Nuances:

• The Boss uses a replacement effect, not banish, so the unit never actually leaves the board
• Since the game object stays the same and never changes zones, all effects and buffs remain active
• This ruling holds true even after the errata to The Boss (which changed "when" to "if" to make it not a trigger)