Looking at the Twin Consort kill.
70% active time.. this means that 30% of the time he had not done any damage for the last five seconds? Is he going afk during the fights?
0% uptime on Savage Roar... Just what?
Natures Vigil used 2 times in a 9 min fight.
Tigers Fury used 7 times in a 9 min fight.
Maim used??
A total of 5 shreds and 4 mangles used?
Conclusion: Your brother is just slacking, going afk during the fight and mostly autoattacking. Why is he even raiding?