Why didn't the ground engineer accurately report the type of smoke and his thoughts on its origins?
Because he's a ground engineer.
And why do you assume that ..... the Captain knows the difference?
Because he is a Captain.
******
Apparently there's a gap in the aviation culture on this subject.
I was interested to know if you guys agree with me that the evacuation decision should be made upon the
colour of the smoke (white=caution, Black=FIRE).