It's a pretty apt description of a polarising player. Yaya Sanogo looks as though he is yet to gain full control of his legs, but still provides something. Upon his arrival at Crystal Palace, on loan from Arsenal, manager Alan Pardew hailed his "chaos factor".
The only issue is neither party are really sure what that something may be. It worked well during the FA cup final, coming on as a late substitute to open up space for other players. He's clearly held in high regard by the coaching staff at Arsenal as his debuts would suggest.
Sanogo made his FA cup debut against Liverpool, a game which came only a week after the 5-1 loss at Anfield. His Champions league debut against Bayern showed promise, using his pace and strength well against world class defenders.
The "chaos factor" alludes to something more worrying. It's such an esoteric quality that it is impossible to really quantify. While a nice soundbite, it screams more of dogmatic justification of his ability.
Sanogo is an enjoyable player to watch. Capable of the unknown, but seems to lack any other more refined qualities. His passing is inconsistent as his debut for Crystal Palace would suggest (56% passing accuracy, 1 Key pass).
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An inability to finish, control or pass means that for all his athletic ability, the unknown becomes a double edged sword. Depending on where you stand on his development this is something to praise him for or just another stick to beat him with.