Think Westley's appearance at the crease more than his actual performance will get him more chances, he seemed to take to it very well, albeit with some issues with the ball outside off stump.
I don't see how Jennings can stay, you can't carry passengers in Oz and he was very poor. He relies on too much luck to get any resemblance of runs, having been dropped on his way to 100 in India and a couple of times in this series.
Malan I think was always a short term stop gap until Ballance was fit enough to come back at 5, think England wanted a look at him as they are looking for an extra batsman for the Ashes tour and he's unfortunately not stepped up to the grade.
As before it leaves a shootout between Hammed & Stoneman to open with Cook as the only selection dilemma Wngland have in my opinion. Woakes will replace TRJ (quicker/better bowler) but I can see Anderson missing some games in Oz. What a tail that would give England! Mo 8, Woakes 9, TRJ 10, Broad 11....