Kakashi_Hatake_2049

So Hashirama thought Kakuzu was playing catch with him

i am not too sure about that.... Naruto manga ended in 2014, 5 kage summit was probably many chapter before, possibly years in difference.. when internet as we know it might not be that developed or used. I didnt have access to internet at that point of time atleast.

Now this premise looks like it has a lot of potential

You read it as "It's existence is said to predate even the Sage of six paths"

Oh okay

Overgeared vibes

Pretty much yea

Kazuya probably can't use sage mode

it felt like he disappeared instantly when he sank to ground for Minato. It might be white zetsu's doing,

My brain just crashed for a sec