Excellent article Giorgos, certainly up to your regular standard. My only comment is that insider buying especially in rallies is far more accurate than trying to interpret insider selling for one very good reason. Insiders often rely on stock options and restricted stock that becomes free...
Interesting tease but it would have been far more useful to include some calculations. I would be interested in seeing an example of the volume weighted index... There are a number of useful volume based indicators out there, Buff Dormierer's Volume Price Confirmation Index, Chaikins Money Flow...