One thing that puts him ahead of all of them is his work rate, all of the others are gifted attacking players but Coutinho puts in the graft needed. I'd have him above all of them at this point.
Oscar has shown his class but players also reflect their manager and since Mourinho came in he's been a ****. Less creative and a horrible and pointless dirty two footer on Lucas. Same with Ramires, was a decent player until Mourinho turned him scum.
Ozil is a world class player and will improve a lot next season. Silva is a world class player and is proving it. Eriksen is solid, but thinks he is better than he is. Also playing for a terrible team at the moment. Oscar is very good, but lost in the chav tactics, he will never be a mourinho player in the long term. Mata, twice player of the year for the chavs, instantly dropped, he would rather lump matic, luiz and lampard in midfield to battle it out. Stoke, just with better players. As for Coutinho, he has a lot he can improve on, but he is showing his willingness to put the effort in and fit in with our fluid formation. I would say Silva>Ozil>Oscar>Coutinho>Eriksen.
I think Silva is number one with Coutinho second. Oscar is playing in a fairly negative team so I think he could do a lot better with a good footballing team so he would be third for me. Eriksen looks a bit lost sometimes and who could blame him playing for the comedy spuds but I think if you put him in a better team he would do a lot better so he is fourth for me. I have never and will never rate Ozil, hes far too lazy for me to be even considered a decent footballer and he constantly bottles big games so I would pick him last out of all of them.
Ozil was brilliant in the opening weeks but quickly tailed off. I think he will be better next season but needs the likes of Walcott, Podolski and Ramsey to stay fit. Its alright being a brilliant creative player that can spot a pass but others need to want the ball and provide the movement for his brilliance to be a option; takes two to make a pass!