It might, a smart or great WR secures the ball and does not extend for a td, he should have never let the ball touch the ground.
If it wasnt 4th down , what he did was excusable, but on 4th down , even worse only 4 min left in game a td on the play is not important, only making a "clean" catch is important.
Anytime they let the ball hit the ground , or let the ball move or come loose, then it can be ruled inc.
The key is in that situation 4th down, you dont want any doubt or give any reason to have it ruled inc.
Dez let it hit the ground, and the ball did move, not a lot but it moved, then it came loose as he rolled over and was in the air, and he re-caught it.
The ref said that was a re-possesion, and did not matter as the ball had clearly come loose.
These calls can go either way, so on 4th down you dont want to give them any reason to rule it inc.
Most Dallas fans will rule it a catch, siting many reasons, and most GB fans will rule it inc.
That play had he just made a clean catch and gone down on his back, then Dallas might have won and gone on to SB , we will never know now.