This is just making excuses for him. You put Ozil in the exact same position in our team and I'd bet dollars to donuts that he wouldn't be shooting anywhere near as much as Coutinho. He'd just recycle possession, wouldn't try and create something out of nothing. What's to say that someone like Lallana wouldn't do better in a team which has lots of runners and movement ahead of him? His output was much better at Southampton. Does he get the same excuses as Coutinho?
And Ozil is a different type of player, put Ozil in some of the games we've had in the last couple seasons and he hides, whereas Coutinho has shown up time and time again.
Ozil has only gone back to his old self this year, before that he had two seasons of hiding and doing nothing, apart from that there different type of players, very few players are as intelligent and as selfless as Ozil, at the same token, very few players are as inspirational and maverick as Coutinho, horses for courses.
But i posted the stat above that he is actually still top 5 in most accurate throughballs since he's come into the league, that suggest to me that at least in previous seasons his passing through the lines and final ball has been pretty decent, if Sturridge comes back and its the same, i'll be worried, but i can almost guarantee it won't be.
Lallanas output has never been better than Coutinho in terms of creativity, throughballs, key passes etc, only goals and assists, excuses won't be made for him because we haven't seen him play the football Coutinho has for Liverpool.