Man, you might as well state how hard Arjuna stomps the shit out of Mahito because this isn't even a battle, it's just a prolonged slaughter that makes the ending scene of Yuji vs. Mahito look like the latter had any chance.
I don't know why people think that Samurai Remnant is somehow "Fate/Stay Night" levels of weak because they can't even remotely look at the big picture in the slightest...
The fact that Servants can outstrip even the typical Oni, Nue and other ridiculously powerful supernatural beings kinda shits on JJK completely and still puts them on the same league. People really need to stop thinking that big boom is the only way to see feats.
Why do Siriel keep saying this bullshit? Shiki Ryougi can interact with Ghosts with her Magical Prosthetic. Servants have been consistently able to fight ghosts and eat people's souls while they are still alive(Medusa literally does this with one of Shirou's classmates). There is no need for specialized abilities for Servants to do that even when Gae Bolg is explicitly stated since F/SN to be able to straight up attack Souls regardless(Which is basically most Noble Phantasms at this point) of the condition of the body or Magical Circuits.
Being able to effect the Soul in the Nasuverse is not even that difficult, it just gets extraordinarily hilarious you can apparently replenish your Soul as long as it's not fully destroyed or entirely absorbed.