I think there's a good chance he will be picked. If Australia win this weekend, then we're 3-0 with one game (that can't matter) up our sleeve before the final.
If that's the case I can see Stuart wanting to rest some forwards before the game, and maybe go in with only two on the bench (along with the utlity/playmaker), and then give Jarryd the 17th spot, and through him on for a taste. GB often go in with only one prop on the bench, much to their detriment, but against them we could afford to do the same.
Result won't matter and he's got him over his first up nerves with no risk to the result, so that he's ready to contribute in the future should injuries to the players ahead of him ever occur. Remember, they picked Jarryd to stop him playing for Fiji, so they have to give him a taste before end of next year to come good on that, otherwise he may feel like he should go and join Fiji for whatever matches they have in a year's time, and then for the World Cup finals.