No, he wouldn't. McDonald, at the moment, in the international arena, has been performing better than Lee.
I had another post to quote somewhere in this thread, but after reading it and coming back, I couldn't find it.
If Lee performs well in the tour games, bowling good line, lengths, with good pace, accuracy, some swing, and bags a couple of wickets without conceding too many runs, he should be playing in the Ashes series ahead of McDonald. I'm also very keen to see how McDonald, Hauritz, Lee and the batsmen perform in these couple of games.