The idea was to put healers last in the list, in case you want the other roles to jump first so healers can focus on healing.
3 stacks = bar & stacks are red
2 stacks = bar & stacks are orange
1 stack = bar & stacks are yellow
Glowing bar = Your name (so it's easier to spot when it's your turn to jump)
No idea how the mechanic will play out in the end though.
thanks to asakawa, Darianopolis, Vardex for helping with the sorting