When you think about it ,a fighter when he is gettting things in the ring going his own way, can start to utilize all that he knows in freedom and can incorperate many different styles that he fancies or has practiced hopeing to create that finish or create that opening to finish,because he is moving in comfort and has no fear of the opponents power.

Some guys you see try to change styles mid fight when they are in trouble to see if they can interupt their stronger opponents rythem and get a handle on the fight again.

Others can do as you say and know the strengths and weaknesses of different styles and time it correctly for their use in most fights.

I think and hope there are fighters being born or who are comming up now who can be completley free flowing becuase they understand why certain moves work in certain situations and others dont work due to a style or situation .
Then we will get to see a multi style fighter who can turn on a dime and plant and sting when it counts, use the ropes to advantage, miss time someone, because they ment to, Switch and hit when its only correct to do so,disrupt balance and or timing off an opponments elbow point,use disruption of movment before a finishing shot so they lean into the shot etc etc.