Seeing as at that point in time, your Servant shouldn't have their parameters higher than C's unless you've been farming like crazy for the most part and 3/4 of your Servants have their NPs still not available , you still win.
Saber doesn't really have any of these problems + Shirou should have at least one CS available to boost her up .
I was gonna say Karna at first and yeah, I remember that not only is Jinako a far worse Master than Shirou but due to how the Moon Cell's rules work, Karna wouldn't be at full capacity in Extra either so yeah, Saber would win.