With Avalon Artoria could potentially stall forever otherwise Gil or Enkidu can potentially solo

Gil and Enkidu have it. The weapon spam can be dealt with but is annoying and constant pressure, double the chains is just annoying to deal with, even if it isn't binding for long there's so many weapons flying around that it'll let one or two hit, and either Gil or Enkidu can cover for each other to charge Enuma Elish or pull out some other bs. The Artoria and Arthur aren't going down easy but they don't have any real win con either.

Artoria doesn't normally have access to Avalon.

Gil with a full powered EA one shots both

Gil doesn't use EA quickly enough

If he doesn't f**k around and starts getting to job seriously, he still slams lowkey

In character he doesn't take the fight seriously, especially not with Enkidu beside him. Enkidu's a bigger factor here as they do in fact handle things seriously

Its not a matter of "Oh he might not be serious"

No it would be out of character for him to be even remotely serious

Without Enkidu he still wins if he takes the fight seriously

We saw what Gil did to Saber in FSN anime with a casual EA while being cocky

Yes and that's completely unnecessary here