What feats has Archer Ilya shown?
Shirou should take this with minor difficulty then. I knew there was something off when I saw how weak the Excalibur was. The fact that Saber Alter had no master would probably put her lower than an average servant due to lack of prana, while in Heaven's Feel, Saber Alter's master was Dark Sakura ( Who basically fueled Saber with infinite prana )
Shirou should be able to replicate anything Ilya just showed.
@CerusSerenade: Actual her stats are not that higher than normal Saber, she's even weaker in some aspects.
And her prana supply comes from the vessel of the grail and not the grail itself.
Either way, FSN Saber Alter and FKP Saber Alter aren't the same either way so Illya still loses.
@Fehafare: Well seeing as we're already using a non-canon character arguing that we can't use non-canon material is a moot point. Nothing about this saber alter is mentioned to be any different from how saber and saber alter was in the canon appearances. Since no contradictions are made we can assume this to be fairly reliable.
Actually it turns out Shirou did beat Saber Alter by himself in a bad end by using Kanshou and Bakuya in their strongest forms.
Ilya loses this.
@CerusSerenade: I never said that you can't use non-canon feats, in fact that's the only thing that you can.
Nothing needs to be mentioned to be different, it's principle alone, a non-canon work character can't use the feats from a canon work. Also the entire FKP series contradicts the canon of Fate on so many levels so...