and why Zoro was able to do that? anything but swordsmanship skill?
he was able to do that when he was a rookie ... when Shanks/Mihawk was at least 100 times above him in skill
Asura likes is a move/mod form swordsman
there is ZERO reason to assume two greatest sword master alive can't pull something like this off
as a move? it would be epic
as a mod ? it would be too much
Shanks and Mihawk being above Zoro dont automatically get Zoro's abilities.
Asura has nothing to do with swordsmanship. Nothing even close has been shown from other characters.
It is a physical manifestation of spirit and certainly a mod, duration is arguable.
Mihawk/Shanks wouldnt benefit from it even if they were capable of it which they arent.
Oda wants to make Zoro unique and Asura certainly is making him stand out from the rest.