If you are replying to me ? ....I have related one story from my 55 years of Aikido study, believe me there are many more.....
Many years ago I had a young girl student aged 9 years, I tried an experiment by teaching her to adjust her body weight when being lifted, first she would allow herself to be lifted over six feet by the big guys, after a few moments of relaxation she could not be lifted off the mat.....no magic here.
Well ki is not magic, but lowering ones center of gravity should in no way make this stunt possible, as the weight of the master/child remains the same. Therefore I will still argue the fact, that something else is happening.
The fact that she needs to relax, does not suprise as relaxation is what makes energy flow.