Yes he is, his numbers for moving the ball into the final 3rd are almost 3x that of McNeil and a fair bit more than Harrisons. I know we don't play a 4-3-3 (we should and could) so there isn't much he can do about it
As for losing the ball, if you think Iwobi is bad wait until you see Harrison, one of the worst for ball retention in the entire league pyramid, and yes Iwobi is not the best tackler but he still wins over 50% of his challenges whereas Harrison is only 23% so don't think he is going to be tracking back helping Patterson or anything.
Look I fully agree he needs to leave, to call him rubbish like a lot on here do, it's just nonsense because he isn't.