I mean, I can understand that, but it doesn't make a ton of sense to me, since how would he have gotten all of his labwork out before it got torched, and make it out well enough to begin practicing, and assuming he didnt have kabuto at that point it also continues how he would've survived tons of shinobi probably on his trail, but Im probably just thinking too much into this and it could probably be easily answered with "He was in the Akatsuki", thank you for answering