I've attended at least 5 job interviews just to see how things go. I didn't want to leave my company, I wasn't interested in the job offering, but I just did that because it is important to meet people, to have experience in different interviews, and because maybe in the interview I could learn more things about the company and the job that would make me change my opinion. In no way I was dying to get the job but I decided to go anyway (and to make the effort to fill out the application and other processes). And I know many of you old enough to have a job have done likewise many times.
So I don't understand why so many people think that because a musician did an audition necessarily means that he wanted the job. Only a very young person with no experience in the labor market would think that, IMO.
I've watched the documentary many times, I enjoy it a lot and I'm glad Marco is there because he's such a fun guy to watch playing (I bought two of his instructional DVDs afterwards). And it can be clearly seen that Mangini was the only guy willing to cut off his nuts to get into DT. PW and AP were very enthusiastic about it too. The other guys? not so much. Just see their reactions:
MM gives a rather cold "yeah I can see myself being part of DT" which is as politically correct, non-committal as it can get.
VD essentially says "yeah it was fun. I'm cautiosly optimistic about the whole thing".
TL "yeah it was fun. Maybe we can do that again sometime".
Mangini sounds like a 13-year old girl wanting to be invited to a summer ball. She is much more intense about the prospects of being on DT than anybody else. Heck, he even brought about the marriage analogy (they're picking a partner for life, they have 7 pretty ladies to choose from, the have to pick well)
He states repeteadly that HE REAAAAAAAALLY WANTS THE JOB. After the audition, he's very nervous and excited about it going well. Before he receives the call, he's almost dying (WHY DID THEY TAKE SO LONG? MY BODY IS NOT WELL. THIS IS PAIIINFUUUUUUUUUL OOOH OOOH OOOH OOOOOOOH THE PAAAIIIIIN). And he orgasmed when he heard James whisper "welcome to the family" and he started crying afterwards (compare the whole thing to PW's reaction: "It's OK. No problem"). And he was willing to leave an stable job at Berklee to joing the band. The other guys probably wouldn't want to leave their projects.
Of course the band was able perceive if the drummers were really into joining DT or not, and that partly influence their decision. Many people said here "The others were great but Mangini really wanted the job so I'm glad they chose him". After watching the videos, it's not surprising that the other drummers say they didn't really want to join DT but they wanted to have the experience of auditioning. That's the natural conclusion one makes after watching the videos.