"So. First step Reverse Turn Foxtrot for the man Foot Rise. For the lady no foot rise. Its been that way since 1920. Pages 175 to 178."
No one disputed this. The issues is that the foot rise used in the situations is MUCH LESS than that used in waltz, because foxtrot does not have waltz rise. If someone dances it with waltz rise, they will not only loose the foxtrot character, they will also have a hard time achieving the desired character because the energy gained from descding from a waltz altitude will overpower their following slow - causing them to rush that step, and then rise too high to absorb the excess of energy. It becomes a vicious cycle of too high - too soon - too high.
"I would suggest that you find one of those top flight professionals . Go frame by frame and see exactly how much the knee bends on step three of the Feather and step one of the Reverse."
Substantially less for a heel turn than for a waltz-type turn. The follower's heel turn is created by arrival onto a largely straight leg - it is this "standing up" that establishes the "on the spot" axis of the turn, and failure to create it is the usual cause of failed heel turns. Of course you can do a heel turn with bent knees - the leader's heel turns are all done that way, but it is improper for the follower to do this as it would then be missing the essential characteristic of a followers heel turn - up, being rotated by partner, instead of down, rotating the partnership as the leader would dance it.