So you would have been happy for a defender to keep it out of the goal in the same manner, you wouldn't call for a penalty?
Are you serious? Oxlade-Chamberlain kicks the ball at Koscielny, it hits his face then hits his hand it goes into the net. Koscielny had absolutely no idea about it. It would have been farcical to chalk that off. Not only was it an accidental riccochet, the player himself didn't even know about it until Ox spoke to him after. In answer to your question: if a player has taken a shot, and it riccochets off the player's body and onto their hand, what exactly can you do about that? I would be totally fine if someone kept that out at the other end because you simply can't get out the way of it.
His hand's in an unnatural position, so it doesn't matter if it was intentional or not. Why do you think that Koscienlny's not offside? He looks miles off when Oxlade-Chamberlain kicks it.
He's clearly onside. Pause at 0:38. As for his hand being in an unnatural position, again, how was he able to move out the way when everything happened at such speed?
You keep saying that he's onside, but you're talking about the Walcott header and not Oxlade-Chamerlain's shot. He's clearly miles off from that. He isn't able to move out of the way, but that's irrelevant. His arm is in an unnatural position, unlike Keane's in the other call. It's a handball.
Sky are now saying that Ox didn't touch it which of course is impossible to prove as the frames are not continuous.
That video above clearly shows that he does touch it and it's pretty obvious in virtually every angle. The last one makes it undeniably clear and they've clearly got access to it, so why are they bullshitting?
Let's assume that I agree with what you're saying. The shot from Chamberlain looked like it was going in anyway and seeing as Koscielny couldn't move from his position, it would have been harsh to rule it out. Common sense prevailed here in any case. That depends on what you define as an unnatural position. He couldn't control where he put his arms when Chamberlain took the shot.