I have a better question :
More seriousely, I believe by "lost" it means "completely obliterated". In this case, nothing is lost, the head is just separated, from the body through space, which prevents the "regeneration". Low key clever
Everything? Contrary to the fanbase, I don't hold strange expectations regarding Imu's power. I take it as it is : a play on the game of Reversi. Something very simple
This power, as I explained multiple time already, is a tool of characterization. It allows us to understand that Imu is willing to make huge gamble on their strategies to win. (in our case, the reversi is a game of control and fear. Imu is gambling on the fact that people won't dare to fight their own (as we see with Kashi). Which is something that would work against most people unless you meet people like Zoro, Dory or Brogy (and probably luffy too)).
You don't feel anything when Zoro is destroying these giants with new technics? I mean... I'm sorry for ya. I love it.
Nah.. That's just something you don't take serousely. I do. That's why I'm telling you to look for the fallouts. Imu is far from done here. This is only the first remote round.
Again, it's a game of reversi, a fight over control and pride. Take it as such. Don't underestimate the opponant. Everything can flip over very quickly.
The games doesn't end until there is only one color on the board.