We have been told that it is down to the company who pull the planes onto the runway.
Wow, being wrong on so many levels at the same time in one sentence.
The controller gave push back clearance to both aircraft. Apparently he did not realise that this Easyjet flight was departing from the D pier and not the H pier, where Easyjet normally operates from. Off course the pushback drivers could have still prevented if they had realised it, but to their defence, the view from the push back truck isn't that good.