I have always maintained the need for 3 in midfield for big games domestically and in the CL. If anything, watching Arsenal play a half like we did against Southampton or some moments in the 2nd half too, I would want us to always play a flat 3 in midfield and let teams go long.
I really am not 'targeting' anyone 🙂
Just think Cazorla isn't a natural midfielder and doesn't have the defensive nous that a central midfielder would. If we want to persist with two in midfield against even the big sides then Cazorla in my opinion should give way.