Big John wrote

You talk about doing a LOOP in association with a roll.

No John, I didn't talk or write about...... I just quoted from the
acro.harvard.edu web site and William Kershner's fine book.
You may not have seen the picture from the Kershner book when you
wrote this, but write back when you have seen the barrel roll as
described by someone who is considered an authority in the field.

My reference is years and years of doing acrobatics and teaching
same in both conventional aircraft and jets.

Still waiting for reference documentation. :-)

Bob