Board Thread:Episode Discussions/@comment-1251315-20161215125344/@comment-25093611-20161216194224

^but that wuld make the stuff with the sword inconsistent (and SPSM is kind of like the tentails jin mode, the only difference i see is that the TTJ-mode is the real deal with the fused bijuus while SPSM is a mix (like a patchwork) out of the bijuus held together/fused by naruto)...

imo it seems like the best option we can take is that being caught 100% off-guard means that naruto and madara/obito will be vulnerable just like normal shinobi, of course they still have the incredible fast healing power so that is ok...