Well, this 'battle' is going to be a short one. On one side you have the single greatest swords(wo)man of the Nasuverse (not counting Fake Assassin), armed with a castle-destroying legendary sword that is second only to a literal world-buster. On the other, you have a low-stat Servant without a single combat Noble Phantasm.

RIP 1/60 of Zero Assassin. No-one will miss you.

(On a somewhat related note, anyone else find it funny that Fake Assassin is far superior to both 'real' Assassins of the 4th and 5th War? Z(ero/erg rush) Assassin lacks any proper NPs, and True Assassin's NP would only work on two of the Masters of the 5th war: Shinji and Kuzuki. Rin, Ilya and Sakuya all have too much magic to be hit by Zabaniya, and AvalonShirou and Kirei laugh it off)