Tony
Swithcing to a computer as opposed to iphone ( possibly the Chateau neuf du pappe could also have had an influence) the Gano brackets are now obvious in pic2.
I am surprised that you continue to compare all the pictures you have posted to Ross's.
The MAIN road, the layby (static target), the pavement (on a busy road), the list is endless, but the main difference is the type of decay you are trying to assimilate here, Gano V Kretz!
I have lost count how many trees I have retained over The last 20 years that have unfortunately been colonised with a Ganoderma, including Fagus. Even a moderately healthy Fagus can outproduce (adaptive growth) what the majority of Ganderma species can consume.
Kretzschmaria Deusta is a completely different can of worms, due to the type of decay, it is very difficult to determine the extent of the decay, the type of rot produced is also completely different and the effect of the breakage if it does let go is much more severe.
K. deusta behaves in two different ways, 1, when a surface wound has been colonised but the decay dosent penetrate too deep (more commonly with trees that form a true heartwood)
and 2, when the fungus has colonised the internal dysfunctional tissues of a species of tree that doesn't form heart wood ( ie age altered wood ro ripewood) as per Fagus.
Unfortunately, what we do when we remove huge amounts of healthy tree (which you quite rightly prescribed a reduction of TWO THIRDS) is to remove photo-synthate material that the tree now desperately needs to defend itself and produce reaction-wood to maintain a "uniform stress", to compound this disability, more dysfunctional wood is created adding to the volume of wood available for colonisation by this fungus!
We can not rely on epicormic regeneration to supply the defecit in Glucose either, epicormic sprouts have considerably less photo-synthesizing ability than normal healthy new shoots.
The exposed nature of the tree (Ross's), is also a major issue to consider when retaining trees of this size, the house which could be argued is sheltering the tree in one direction could create turbulance that could possily DOUBLE the windspeed under certain circumstances.
I truly feel for the TO that had to make the decision to fell this tree, invariably people that choose a career in arboriculture do so because they care about trees and having to commit this tree can not hve been an easy decision, just the same as the poor souls having to remove it must have felt making the first cut (as Arbs, we are all aware that the more you remove the easier it emotionaly gets)
Incidentaly, the pic you posted with the work done looked good to me, very well balanced reduction I would say, however, if you look back through this thread, you will see that I never made any reference doubting your ability as a tree surgeon!
Good luck to Ross with the rest of the reduction
Kind regards
Jonny