izanagi in danzo and obito's case does not grant you 10/11 "lives". in fact you never die at all, except i guess once if you lose the fight. izanagi is a genjutsu, just like any other. you can die infinite times while its active and never actually be harmed except by chakra level depletion. kabuto has probably killed itachi 1000 times in his izanami trap but none of those kills count as a real one.
what izanagi does is enable you to rewrite an unfavourable outcome as a dream. lets say you were stuck in a paralsysis jutsu or took a scratch. you can rewrite it so it didnt happen as many times as you want within the time limit. if your time limit is 1 minute per eye, then that means you can rewrite the outcome infinite amount of times till your eyes are all used up and blind.
in obito's case he had to rewrite billions of bombs hitting him as a dream again and again for 10 minutes, and respawn away from the explosion. each time he respawned, it was near the explosion again. we know this is the case because after 10 minutes, konan sees him again and hes taken no further damage BUT his eye is now closed forever.
izanagi is not a "spare life" in the sense that kakuzu's hearts are. and if you dont need it to beat someone you can just deactivate it. meaning a shinobi could cancel izaangi before the minute is up, and keep that eye around for the rest of his life. because he never used up the time limit. in danzo's case, he couldnt afford to because susano is too strong offensively and defensively. sasuke's only option for defeating it once understanding it was a relentless physical assault to keep danzo on his toes and using it all up.
the point is killing danzo 10 times does nothing. for one you never killed him at all. you hit an illusion. he just washed away the damage so it appears like it never happened. danzo also doesnt bleed real blood whne hes an izanagi, because sasuke had blood on his face when he crushed danzo. when danzo respawned, the blood was gone.
your not killing his extra lives. your making him use up the 1 minute time limit on the izanagi, in which he can die any amount of times and still rewrite it.
what izanagi does is enable you to rewrite an unfavourable outcome as a dream. lets say you were stuck in a paralsysis jutsu or took a scratch. you can rewrite it so it didnt happen as many times as you want within the time limit. if your time limit is 1 minute per eye, then that means you can rewrite the outcome infinite amount of times till your eyes are all used up and blind.
in obito's case he had to rewrite billions of bombs hitting him as a dream again and again for 10 minutes, and respawn away from the explosion. each time he respawned, it was near the explosion again. we know this is the case because after 10 minutes, konan sees him again and hes taken no further damage BUT his eye is now closed forever.
izanagi is not a "spare life" in the sense that kakuzu's hearts are. and if you dont need it to beat someone you can just deactivate it. meaning a shinobi could cancel izaangi before the minute is up, and keep that eye around for the rest of his life. because he never used up the time limit. in danzo's case, he couldnt afford to because susano is too strong offensively and defensively. sasuke's only option for defeating it once understanding it was a relentless physical assault to keep danzo on his toes and using it all up.
the point is killing danzo 10 times does nothing. for one you never killed him at all. you hit an illusion. he just washed away the damage so it appears like it never happened. danzo also doesnt bleed real blood whne hes an izanagi, because sasuke had blood on his face when he crushed danzo. when danzo respawned, the blood was gone.
your not killing his extra lives. your making him use up the 1 minute time limit on the izanagi, in which he can die any amount of times and still rewrite it.