No. It was not in Toriyama's original manga, therefore it is not canon. It was more or less made up to promote Dragon Ball Heroes (the video game).
Bardock's introduction in the 1990 TV movie Dragon Ball Z: Bardock - The Father of Goku was never considered to be official canon by many. The Minus Version - The major retcon that Dragon Ball Super: Broly makes to Bardock is confirming that the Dragon Ball Minus version of the story is now official canon.
It is said that in his prime, Hiruzen was stronger than ever other Hokage who came before him, and yes, that includes Hashirama Senju. Despite this, even as an old man, Hiruzen was extremely powerful!
It is said that in his prime, Hiruzen was stronger than ever other Hokage who came before him, and yes, that includes Hashirama Senju. Despite this, even as an old man, Hiruzen was extremely powerful!
If you are referring to the first time Hisoka lost a limb -> The fight vs Kastro, He was healed after the fight by Machi who used her Nen stitches. If you are referring to the second time -> The fight vs Chrollo, Hisoka refused Machi's help and put himself back together with Bungee Gum and Texture Surprise.