Best 11 has to be Dula's "Big-Game Squad". Wilshere is not gonna play instead of Santi, and he won't do Arteta's job so he's second choice to Ramsey as well. Flamini is Art's backup until Wilshere learns to play the deeper role properly. Honestly, Wilshere should be a sub if not for our injury crisis...sticking him out on the wing is not great either. He's a butter-knife in terms of final product.
Everyone talks about Özil's combination with Cazorla and Wilshere, but I think he and Arteta could form a great symbiotic relationship in midfield.
Jack isn't ready, just like Ramsey wasn't ready. He will be, but he doesn't need an extended run of baptism by fire while forcing our first team to deal with his growing pains. If he keeps on playing, he'll have to go back to basics and learn to defend and keep the shape in midfield or he'll be our "dud" for the season. Wenger better not force the role on him if he isn't ready for it...but we all know he will because he's stubborn and values player growth over all else.