Yeah that's one way to do it... but most of the time... from what I observed... most of the time, the percussion section is just overloaded with too many members, mostly people who failed at other instruments.
Since you said that there's a "test" before they can qualify into being part of the section, then what happens to those who have bad teeth AND suck at percussion? They should obviously get fired, right? Not to sound mean or anything but there really are some people who cannot make it lah. That's not a sin or anything bad, but it's bad when those people THINK they have the talent, when they obviously do not.
I've had a bad experience with that, and it's made me very sceptical about people now... at first I never believed that all those Americal Idol/Singapore Idol auditions with those delusional kids were true (I thought they were usually staged to give extra humour to the show), but now... I really do think that there are such people... people who can't do something for nuts, yet behave they can. These people are worst of all...