I simply don't understand how footballers, who have played the game, can even debate this (fans who are in bad faith, pundits who are deep down hostile to us, yes, that I understand all too well).
When you jump as high as you can from a standing position, your ams do not stay straight at your sides as if you were a soldier on parade. Everybody knows this. It's kinetically impossible. Jack's arm was somewhat out from his side, maybe 20°. And he'd have to be a very clever boy indeed to know that the ball was going to head towards him, and exactly there. It wasn't at a bloody right angle.
There's nothing whatsoever to see here.