Easy Tiger!
GRIZZLER.
Sounds like you've been out in the cold too long this winter. Calm down, no-one is trying to score points here, just offering advice and info based on their own experiences.
Dr 'I' knows his stuff as I'm sure you do too. He may not be 30ft up there doing a clear ice check at 5 in the morning but if he signs the tech log or the transit check on the a/c then it is he that is taking the responsibilty for the de-icing. So, when he says 'supervising' what he really means is that he hopes to hell people like you know what you're doing as he has to go on trust that you do.
Likewise, SpannersatCX has been doing the job long enough to know what he is talking about.
For what it's worth.
Kilfrost ABC II K-Plus.
At -3C and above in snow.
100% Holdover 1:00hr to 1:40hr.
75% Holdover 35 min to 1:10hr.