Originally Posted by Human Rasengan
KYF.. Tsunade's regeneration is Automatic there because she activated the Byakugou.. without using hand seals. the jutsu is activated .. not the markings of the jutsu on her body. while activated the jutsu heals her instantly .. but if you remmeber when the tree landed on her the seal wasn't activated and katsuya offered to stick her back together. the jutsu has to be activated.
Neji and Hinata learned to activate the Byakugan without seals.. remember they used to have to do hand signs to activate it. but the Byakugan isn't on till they will it so. same with Hashirama. if they don't activate the jutsu . it wont be on automatic healing.
Some cars have cruise control but the "automatic acceleration" doesn't work until you turn it on
Madara recognized the AUTOMATIC healing that tsunade did, not her jutsu, which made him realize she has the exact same ability as hashirama. Thus, hashirama had automatic healing as well... otherwise, why would madara see tsunade automatically heal the damage his susanoo sword gave her, the tell her she has the same exact ability as hashirama which in his opinion is the ability to restore oneself/heal without the use of hand seals...
Quit ignoring the context of madara's conclusion of why tsunade has the same ability that hashirama did...
This is not about other jutsu must be automatic is they require no hand seals, but the fact that it was the automatic healing that made madara compare the two to which he gave the explanation of healing without hand seals... Point still being, Automatic regenerating is what made madara conclude tsunade has the same ability as hashirama...
It is simple, hashirama had to of had automatic healing for tsunade after automatically healing to be said to have hashirama's ability... and not one all her own..