first off, in my opinion the athlete should have been dq'd. it's a really, really, really simple rule that takes no energy and minimal intelligence to follow. follow it.
yes, there are lots of stupid rules in sports--for years, in california high schools, they instituted a no-jewelry rule (ostensibly, in the name of safety). this was harder to follow, because athletes of both genders weren't used to it, and it resulted in disqualifications. as a coach, it took me a while to get in the habit of checking my athletes before they went to check in, but after one dq, i learned. fortunately, the rule was rescinded after a few years.
but bringing your jersey and putting on your bib should be as automatic as bringing your shorts, your socks, your spikes and following whatever logical and illogical routines we all follow when preparing for a race.
also, for those that say a bib and/or jersey serve no purpose:
1) they both may be used by competitors to identify each other. there are always certain jerseys i may look for--as a former ucla bruin, you better believe i looked for usc jerseys--and no, i didn't always know them by appearance only. as a coach, i may tell my athletes to look for certain jerseys as well. certainly a kid from cornell is not going to know the msu kid by appearance, and a fair part of strategy is scouting your opponents by their schools. and if there are two kids from msu, i may just want to know who is who by their bib number. remember, it's still a team sport in college, and the meet is scored as such.
2) the bib is extremely important for advertising, which is something our dying sport still needs...
finally, he should be disqualified just for being named justine.
that's my story and i'm sticking to it...