Caguioa, cannot be traded because he still holds much sway within the BGK crowd (aka fantards) and RSA ...... part marketing, since Caguioa has been BGK's face for the longest time now.
A good majority of the PBA followers nowadays are fantards - these people have not played a single minute of basketball, they do not care about the sport, its rich history, its rules and general fair play, etc ...... all they care about is to see their idol and his team win.