I doubt that honestly.
Raphinha is in his best form these days. Why would Hansi Flick decide to cut him from the starting lineup to "rest"?
It doesn't make sense while he is one of top goal contributors. Rashford will need to earn his place there. He will need to work hard to stay fit and impress the manager. I can't say he has been in his best physical shape recently.
Let's not forget that Rashford can also play as No 9 sometimes. Besides there are many games to play and Raphinha can't play all the time let's be realistic with ourselves. And also to avoid overdependence in one particular player, Barcelona had to bring Rashford in. We have to be applauding Barcelona for have two good players in one position. How many clubs in the world can of having two quality players in LW? The world cup is coming up next summer and every player wants to be fit and available. If Raphinha plays all their games next season, he risk having long term injury.