Sorry, i think u got it a bit wrong there, age has nothing to do with making mistake, is actually quite the opposite, yes aging will take away your speed and ur stamina, but it also mean gaining experience. As a CB, experience is more important than the physical part.

And MATA definitely not the same type of player like DI MARIA or RONALDO. Both of them are speedy player and like take on defender which is crucial for the break neck speed counter and beating defender for cross in or cut into the box. While MATA does not really have that speed and rarely beat defender, his asset is his passing and vision. I see his best position is at AMC, OZIL role, spraying thru ball. A better comparison for DI MARIA or RONALDO type of player to us will be SHURRLE and HAZARD which both prefer the same role as AML and MOSES at AMR.

I also agree that KDB have been impressive during the friendly playing in the center role, where he play most at W.BREMEN while at GENK he was AML and is not exactly bad for KDB to play wing again because he got some really wicked cross. OSCAR play best at AMC, but at BRAZIL u can see he switch to left flank when NEYMAR cut in.

But i think who play where will be depend on who is starting, if OSCAR+MATA then most probably MATA on the wing, OSCAR center, if SCHURRLE+HAZARD then SCHURRLE left and HAZARD center or right. One thing for sure our AM are so flexible and during in game switching position it gonna give defender a hard time, man marking is difficult and a full back have to face few different type of player 

he definitely more physical than mata.
but mata vision is much better.

Talking about MIKEL, today he is disappointing again, was hoping he will be improving but his work rate still suck and play it too safe. So many times when he receive the ball he decide to pass it back to the CB, even there are option up front. Not only that, after he do the pass he stand there like a deadwood. Come on, after u pass the ball u should be moving to provide option to receive the next pass, i think that is very basic but he been pretty lazy. I can still remember his Super Cup game last season, when he lose the ball, he did not even bother to run back to cover but just standing there. 

I definitely rate him last in the starting order, RAM > ESSIEN > LAMP > GINKEL > MIKEL. He seem like lacking motivation while other are working so hard to claim a starting place. Maybe been at the club and comfortable for too long. But he do play better with NIGERIA taking more responsibility in advance role, at CHELSEA he been passive.

i did, but hvnt select my team for this season. to be honest, i dont know who from chelsea will be assured of a starting 11 place but i am gonna choose mata and hazard.

striker, i will go for rvp. he is really good in scoring goals 

others, not sure yet