I agree that since he fought even with SSB Goku, sized up Golden Freeza and knew he could stop him he tried anything, Vegeta stating that he still has the highest potential of everyone around, and him training with Piccolo for a day or two got him up to fighting evenly with Goku without KK that he would definitely benefit from training 1 year with Whis. He would probably go beyond Vegeta's SuperBlue form if he were to jump to the next level of power transformations imo.