Thats the main valid point that prevents us from going all guns blazing to 4-3-3. Mata does thrive as #10 but both Hazard and Oscar plays their best while operating in that role, like, when they we're at Lille and Sao Paolo respectively. Mata can obviously work in the RW with Mourinho opting for the invert winger option. I think players must suit their game while taking the entire team into consideration and not complain(Not saying Mata is complaining)....4-3-3 FTW