The beauty of this is it lets us mix and match within fights. We won't need to go all 8 jobs or all 8 classes.

For a random Ifrit you could have
1PLD
2whm
2blm
1thm (for i whms go down, will be able to cure and raise)

any other combo of dd classes/jobs for last 2 spots depending on what you need: people die a lot? classes for raises! self cures a problem? classes for second wind (if the job doesnt give them access to it) otherwise if they're all doing their spots, go for jobs and specialise