Glush
I am sure you are entirely correct in the circumstances you encountered.
However to offer another perspective there are occasions when an experienced pilot can safely take advantage of an opportunity without causing any inconvenience.
At my home airport there are two routes onto one of the runways. Many a time I have pulled up immediately after the aircraft ahead at the hold. Familiarity enables me sometimes to rattle through the checks whereas it is obvious the aircraft ahead has a student aboard and the pace is much slower. With the luxury of a quick call to AT and the requested departure from the interesection is granted although to by knowledge sometimes to the annoyance of the aircraft ahead. Why? If they werent ready (still turned into wind doing power checks) why so precious?
Perhaps the answer if in doubt was "G-XXXX ready immediate unless any objection intending to depart while G-YYYY is back tracking".
The CAP watch dogs will almost certainly object to such terribly non standard RT but sometimes plain English has its merits.