I don't think Broncs lost it with their gameplan, they had relied on their flexible defence all year.
I think they got too tired, the Cowboys surged the last 20 and Broncos didn't have anything left when they had the ball. St George defended their way to the premiership in 2010: they beat us by kicking to the corners and defending the sets.
I also think that when it came down to trying to get the ball near the opposition's line at the end, Cowboys still had Scott, Tamou and Taumalolo going forward, particularly the later who had some massive carries. Broncos forwards struggled to work out of trouble, particularly with Blair and Thaiday as the match-ending props.
Sometimes footy plays out like tennis, you just need to hold your serve and hope your opponent gives you an opportunity on his. Cowboys held their serves in the last 20 mins, Broncos only dropped their last two serves, but it cost them.
Reed and Milford slid on Morgan for 79:50 of the game, no idea why Oates decided to come in hard on that last play and leave his winger, no way was Morgan going to beat both Milf and Reed to the line.
I was of the feeling that if extra time went 20 mins like in 1989, Cowboys would have finished all over the top of Broncos.