Lol? What are you on? Artoria can't contend with Gil, who Enkidu is equal to.

Nasu himself said that Gil and Artoria were equal in life, and that, in a battle, Gil would have a slight advantage because of his "omniscience".

In life does not equate to as a Servant

Servants don't have anywhere near all of their stuff, like, Artoria in life had Rhongo, Avalon, Xcal, and her horse all at once.

I thought it was about the characters while they were still alive, after all, the post author didn’t specify which class the Servants would have, nor the battle conditions

We don't have any feats for them in life or real statements to compare on, so the default is Servants.

12 Strong servant is kinda tell much even for Enkidu

No not at all.

It might be a bit on the difficult side, but Enkidu has a LOT of options to handle multiple at once. Chains, Shapeshifting, etc

Artoria vs Enkidu is debatably in Enkidu’s favor but all the knights at once is definitely more than enough