Obviously i didn't need a parser to discover this bard was underperforming. Wrong accesories and missing one actived the alarm.
With a parser, you could show his number against other party members. During that AV run, i was a bard too, i doubled the damage from that bard.

I killed a tons of time the first boss from AV and was the first time, the healer was out of mana. I had to eat 5 fruits with 3 stacks each one. After the kill with LB1, i checked the parser and that bard did 10 dps more than tank, and me 100 dps more. It's a lower difference, but doing a dungeon lvl 49, it's a big difference.

Be prepared, he is lvl 50+ and he is ready for Dusk vigil or other HW dungeons. Will be a pain if he doesn't learn anything from his job.