I dont rate Sinclair that much, but he's better than Walcott and I have no doubt he would do even better than Walcott at Arsenal stat wise. Walcott is the perfect reason why stats are misleading in football. This guy contributes nothing to Arsenals general play and he relies at arsenal midfield play him through and then he either crosses or take a shot, most times he mess it up and few times it works. He cant beat his man and struggles big time against defensive teams. I would say he's one of Arsenals biggest weakness.
Go for Sinclair ffs if you gonna go for a sppedy winger. just like Arsenal City plays against teams who defends and hit them on the break. Surely the idea for a new wide man is he needs to be able to beat players?