1 if you brake prefect before turning, you can let off gas and engine braking until apex. this means you still have just right amount of speed to complete until a pex, so when you hit it, gave gas.
2 for #2 maintain gas through out the turn. when you do this is because 1 you not sure how late you can brake so you early brake cause you have to give it a bit gas to apex, 2 brake too early, so you have to give it a bit gas to apex. #3 you brake almost prefect, so you have just a few feet before apex so you can open tiny bit of throttle to complete the turn.
all above applies if you reach the max entry speed, know the apex, where to turn, the only thing left is how much throttle apply through out the turn.
im not a motogp racer, but i dont know how much i bs out of this. it meaks sense to me. it sounds very high risk, late brake, reach to max entry speed then turn in, let off gas to apex, assuming by that time you are right next to it, then give it gas get the f out there.
maybe some pros can correct my theory.