Sir, since I have no information concerning the extent of GM Yeo's classroom experience with General Choi I have no opinion on this. Eve if I did, As far as me commenting on who is a "Higher Authority" if it is based solely upon whether your instructor or mine is of senior rank - you lose. Other than that - Courtesy will not let me comment on the accuracy of your claims, as to the accuracy of GM Yeo's perspective.
You said that you couldn't find any info on him, then you did.. So do you take that back?