The other drum being repeatedly banged here is entry height for the manoeuvre in question. This has been addressed several times since it was first raised, most recently by Background Noise and Fortissimo.
Trim Stab, you are still making incorrect quotes about DA and these may be affecting your judgement on this matter. For example,
Originally Posted by trim stab
The AAIB preliminary report states that he commenced the display at 200' rather than 500' which was authorised
The Special Bulletin only stated the entry height, it did not go on to state anything about "rather than 500' which was authorised". It actually states
and then commenced a descending left turn to 200 ft amsl, approaching the display line at an angle of about 45o. The aircraft then pitched up into a manoeuvre with both a vertical component and roll to the left
I hope you now understand that the minimum entry height is not specified for that manoeuvre other than his overall display minimum.
As for being off the display line at entry, that is precisely the point of that manoeuvre. On the day it was 45 because of local restrictions.
In terms of energy, there is no problem with commencing a vertical manoeuvre from an altitude lower than the exit height provided the entry speed is appropriate. There is no evidence to suggest that AH flew that part of his display any differently on this occasion from previous displays or practices, with the possible exception of the amount of roll in the vertical to account for the different approach angle.
Those looking for fault or any deviation from authorisation and possible repercussions will now be able to look for something else to latch onto and beat to death. Your blood lust unsatisfied, you will doubtless be very disappointed.
The AAIB may well find that the entry height was a factor and may well recommend a change to the practice. Or they may not. We don't know and we shall have to wait. An interim report is a possibility in this case so it may not be that long.