Quag is very creative and i think he can play Vucinic's role with ease. Esti and Gach are too similar to Pepe and we could do with Quag , Alex or Elia but the latter cleary hasn had enough playing time and i know for sure Alex wont get the nod ahead of Quag for this game. Quags are best option for this game nut i wont complain if Esti plays just dont want to see Giach starting his finishing and final ball scares me.
I agree with you, in the second half against Novara Quag showed his creativity, for example the backheal to Giaccherini. He is good at protecting the boll and wait for support, just like Vucinic.
This will be a very hard game and I would be satisfied with a draw but if there is a team in serie A that is capable and worthy of breaking Udinese's winning streak it's us.