Musclemeds did not drop him. When they wanted to renew, Kai and his manager wanted a lot more money, close to 500K from the 250K he was getting. Musclemeds opted not to overpay for Kai. Simple business decision. Kai did not build Musclemeds as he contends.
As for Phil, Muscletech did not drop him either. They wanted to renew, but Phil wanted a lot more money, close to 800K instead of the 500K he was getting. When Muscletech realized that Phil was not going to budge, then the legal paperwork came out in ending their relationship. Another business decision.
Kudus to Phil Heath for building up Gifted Nutrition, as well as Kai Greene for building up his own line (Dynamic Muscle). Of course, there are the financial and creators behind the lines (the athletes are the 'face' of the companies).