With no rest, I see them struggling from 6 onwards, but looking back at the gauntlet ordering, 13 is easier to handle than some of the earlier rounds that come near the end of their stretches. If they get Caedus and Revan, they outnumber the sith 5 to 3. Luke kills Palpatine, then two each could double team Plagueis and Bane.
Team loses around 7-8 for sure, if not sooner. They should be too tired by that time to defeat those 3 sith.
__________________ "You must begin by gaining power over yourself; then another; then a group, an order, a world, a species, a group of species... finally, the galaxy itself."
- Darth Plagueis
"She may be small but she packs a punch and when shes in this mood...she goes for my danglers" - Oghren, Dragon Age
I think that while 7-8 is hard, the fact that they're melded may mean they can get by... and then at 9, full rest plus Caedus, they're back in the game.
They'll likely be quite tired again by 11, might lose there or if not there, 12.
If they did make it to 13, with a new fifth member and fresh again, they'd clear.
Though they'd have to be really sloppy to get injured that early, they should all steamroll in match 1.
If they could clear 8 I think they could get to 14 but then be stopped. While not likely, one of the more powerful jedi sacrificing themselves by becoming one with the force may be enough to get the survivors a win at 14.
To imagine how powerful Luke would become if his boost was similar to Ganner Rhysode's boost when becoming one with the force in NJO...
__________________ "You must begin by gaining power over yourself; then another; then a group, an order, a world, a species, a group of species... finally, the galaxy itself."
- Darth Plagueis
"She may be small but she packs a punch and when shes in this mood...she goes for my danglers" - Oghren, Dragon Age
13 is a 5v3 right after a refresh, so I think they'll all come out of that alive and in good shape.
14 is hard, but Luke can beat Palpatine on his own (or maybe Luke + Kyle to play things safe) while all the rest pile on Abeloth. Caedus, Kyp, and Revan combined is going to do a lot of damage.
I think 8 and 12 are the biggest sticking points- that's the worst intersection of 'tired' and 'strong opponents.'
Luke beats Yoda (he's not that fatigued), Caedus may lose to Windu via vaapad and fatigue but he holds him off, Kyp beats Galen Marek, Kyle beats Sunrider, and Kyle can win in time to help Caedus.
Even without rest, nobody on the council is powerful enough to do much. Maybe Jadus would pose a mild challenge for a few seconds.
Easily win, it's 5 vs. 3.
They might lose to Abeloth alone. But honestly if it's the weakened Abeloth in FotJ, Luke + Caedus have a shot at beating her if Luke does oneness, and then Revan + Kyp + Kyle might be able to beat Palpatine.