Hm except IIrc the manga also said the Uchiha have unparalleled chakra along with their sharingan. Which makes the DB credible on that end.It would be redundant specifying that Naruto also cannot reconvert if its something that cannot be done at all. That said 40% goes to waste suggests that is the case and in the event that i'm incorrect (though i don't recollect the Tobirama scenario) its irrelevant to this topic as at that point, Naruto could not reconvert Chakra back into stamina and so Kurama's chakra can't expand his stamina as well. The seal was said to only let it leak through nothing about conversion.
Not to mention Kakashi doesn't even mention Kurama's chakra but Kurama's influence which could be anything tbh.
Agreed. But that does not mean we discredit the db entirely does it? Its also like how the scan Naruto X Hunter posted says Uchiha have enormous reserves but separate db's have Itachi and young Obito both with 2.5 in stamina. Granted Itachi had illness but compare 13 year old Obito (2nd db) with 12 year old Gaara's stamina in p1 (4) and its clear despite being an Uchiha, Obito didn't have large reserves pre senju implants but i'm not going to use that to discredit that NxH scan completely.
Also as per Karin, what makes her have low reserves? I think i read somewhere on this site that because Karin was going to get old from refueling Tsunade that meant she wasn't using chakra but vitality. That is the only tech Karin does 98% of the time in the entire manga iirc.. so how is it she has low reserves if she doesn't use chakra to heal?
karin always ran low on chakra from healing one time Sasuke vs Bee she ran out. And iirc Sasuke vs Danzo also during the war everyone got a chakra boost so at that time I guess we can say her reserves increased but she still only healed once and tsunade didn’t even get half her chakra back.