An idea I believe stifled my Jiu-Jitsu growth over the years is the concept of position before submission. While this is an essential concept from the standpoint of explaing the relevance of gravitional advantage to beginners, I believe for Rickson Gracie submission is the logical endpoint of control. That is, he’s controlling no more and no less than he needs to submit you. Unless he’s resting, everything is being funneled towards submission.
From the preceding frame of reference, passing the guard is a defensive measure as it dramatically reduces the amount of attacks your opponent can threaten with. Same with ‘holding’ knee-ride or mount. From a submission perspective these positions don’t become offensive until you begin threatening with attacks and exist to serve the finish.