You are wrong Harold, the only way they both wouldn't have been called is if the FIRST was a 15 yard personal foul ( like the defender grabs the WR facemask and the WR pushes him off him as the ball is in the air ), then that trumps a PI. I say it was a Defensive PI because we have seen the Hawks get called for that with WAY less contact than we saw on this play a half dozen times this year.
Like I said, I could be wrong, but look at this facemask grab by the WR, Kind of hard to turn your head to look back at the ball when the WR has you by the facemask.