Bubbles seem to act too human to be true. He seemed to be a human kid in some monkey suit. He further said that MJ looked for affection and love and Bubbles provided him with all that. He and Bubbles shared a bond so special, that it cannot be properly deciphered in mere words.
Carole Jahme happens to be an evolutionary psychologist as well as an expert on apes said that chimps are good huggers damn and the relationship between MJ the man and Bubbles the ape went a little over the top, however it seed that the two were life-long buddies, who couldn"t be separated. They were extremely close to each other and seemed to understand each other"s senses. The bond that was built between them was exclusive and beyond a typical comprehension and understanding of relationships.
It is also said that a few doctors were implored so that they could operate on the vocal chords of Bubbles in order to make him talk. This was really eccentric a step.