I agree. The Jedi masters have more access to knowledge of the force than any one else. Look at the Dark Jedi were only knights or padawans when they left the Jedi order so they may have learned some powerful force powers faster but some things of the force they couldn't have learned because only the masters had access to and were able to learn, like Yodas ablity to absord force lighting right in to his hand. They can spend all the time they want learning new things about the force and become better. The sith can spend some time but they also must spend more time avoiding the jedi and rasing followers.