How do you know?
The first thing and most important one, to defeated of disturb Kamui user you need other Kamui.
The second thing is you don't needed to imagine in your head about buddha or Jukai Koutan or Dragon or Golem, it because when fighting someone like Obito, the battle field is more focus and small, Look at when Kakashi, Naruto and bee is fighting Obito alone, there is no Bijuu dama or large scale attack. Not counting KCM naruto vs Bijuus TBB.
It because all massive jutsus is futile for Hashi because Obito can enter kamui and suddenly appear again, he can phasing any solid surface in intangible form, He can attack using Kamui dimension like Shuriken attack. Obito just need precise attack not massive AOE attack like Hashi to defeated the opponent.
The power Obito have is for quick and precise attack, ambushed, surprise attack, small or limited space battlefield oriented fighting etc.
Don't get to spellbound or fascinated at Hashi large scale power, because HAX base person not needed large scales attack to kill an enemies. Learn how fighting is perform.
