Sorry for the lack of response to this thread,
update so far, not long after I had the flush, not a fault of the flush as the flush filter waa sparkling like a glitter ball,
76k new vvcam excessive wear over cylinder 2
84k new radiator brackets broken torn hole in top of rad as if it had an accident (no evidence)
87k engine rebuild due to water damage to cylinder 2
98k new egr, valve due to snapping needle replaced by mazda as a courtesy as it's their drive to keep their engines eco clean.
109k no more engine problems Serviced every year without fail as the car asks for it and digital service log has no gaps, faultless drive so far.

As for engine change in back yard, when I saw my car on mazda ramps the sub frame had to be dropped. To allow the removal.
I knew this as I had to transport the engine myself to an independent engine workshop.