It's a hard one to call.
If England win this one and retain the Ashes, is that mission accomplished?
Or do you still want to go all out in the test at Sydney to ensure a series win on foreign soil?
If it's the former, you can probably carry an out of nick Colly for one more game.
If it's the latter, and you need your no.5 to be scoring runs you'd have to go with Morgan.
That said, Colly has played the last few deliveries quite well so we might be getting a bit too far ahead of ourselves.
