Thats how it should be. They have to be judged this season together.
If Lutz outkicks Grupe then the front office should be criticized and fans absolutely have the right to attack them. If they both perform well and kick in the mid 80s percentage wise and make their extra points, it was a good move by the front office. If Grupe outkicks Lutz then the front office should be praised.
It's just an odd move at this point in a win now scenario to take this big of a risk on a young guy when Lutz has had 5 great years out of 6.