No, an intentional shove in the back when someone is in the air should always be a flagrant foul. I don't care who it is or what the end result is. When a person who is shoved
Incidental contact like elbows on faces in traffic shouldn't be flagrant fouls.
I don't care who the person is. There's no magic here. There's no officiating him differently. It's about officiating him the same as a perimeter player.
Why are you having trouble with this? It doesn't even have to do with his free throw shooting. This isn't about him, it's about the way referees treat big men in this league. If LeBron was shoved in the back it'd be a flagrant two. If Ty Lawson was shoved in the back it'd be flagrant two. If Dwight (or Horford or Pekovic) is shoved in the back it's a normal foul.
That doesn't make sense.
Obviously he should make his free throws, but that shouldn't stop the right call from being made in the first place.