Well, Will Smith was not feeling very well btw 93 to 99 or 97 so and I really think his friends was the ones who got the most problems because of it. Will had problems to manage the fact that he was a celebrity and that made both Rock C and Jazzy Jeff mad. The fact that Jazzy is a mature man who understood Wills situation made that he didnt want more money and glamour then i already got from the JJFP-years.
Rock C was a gloryhunter. He wanted more money cause he was mad on Will. C didnt want the era to end and he didnt understand why Fresh Prince decided to call it a day. C knew that he was never going to be a star, so he sued Fresh Prince because he knew that the JJFP-era had ended.
This is just speculations by me, written on sucky english.