“I have a slight inkling that Ali is perhaps not instructed to kick the ball directly out of play and perhaps on the training ground he doesn’t.”
Ali kicks the ball to be headed on by Boyce or Beausejour standing where the side line meets the halfway line. If they miss it, of course it goes out.
It’s a more difficult task than just booting it up-field. Boyce and Beausejour are often strong enough to win a challenge in the air. Martinez must think that it gives Di Santo and Kone a better chance of gaining possession.