Rockie, your question of why someone should strive to be a 0 rather than striving to be a +1 was answered, by Chris Hadfield. In his book, which you said you read. But for those who haven't read it, I'll attempt to paraphrase his answer.
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To start, being a 0 does not being doing nothing, or not contributing to the team effort. That would be a -1. A 0 is the guy who comes in, does his job as he's expected to do, and everyone is generally happy with his results. Nobody had to pick up slack from him, fix anything he damaged or messed up, etc. On the other hand he didn't revolutionize the way things were done, he didn't go way above and beyond what was expected of him, he just did his job well. A +1 is the guy who came in to do a job, and not only did it well but found ways that the team could do things even better than they had been, or found efficiencies that nobody else saw and exploited them, etc. When the +1 leaves, the team or organization is functioning even better than when he came in. The problem with always striving to be a +1 is that it can't be forced, it has to come naturally as a progression of being a good 0. The guys who come in immediately trying to fix things and make things better, without first taking the time to become good at what they were supposed to be doing and pulling their weight, usually end up making things worse. The people who actually end up making things better are able to do so because they strove to become good at doing their jobs first and foremost, helping out when needed, and staying out of the way when not.
A good place to observe this is on military courses. In a big group you usually end up with a few -1s who complain, don't pull their weight, and so on. Most of the bunch are 0s, who are just striving to meet the course standard and learn the material. They help each other out when needed, but don't stuff their noses into places where they don't belong. The ones that are putting the most effort into being 0s are the ones that end up being top candidate, since they were actually leaning towards +1 simply by virtue of trying to do a good job. But there is often a handful of people who really *want* to be the top candidate - they want the instructors to see how great they are and will go out of their way to show it. They are the people who will say "I know they told us to do it like this, but I think that is a better way to do it so let's do it like that!" They are the ones striving to be +1s, and often failing at it because they don't acknowledge that the instructors generally know what they are doing, and don't realize that they are being told to do something a certain way for a reason. They just assume they know better.
Anyway, I hope everyone reads Mr. Hadfield's book as he does a much better job of explaining it than I could.
I think we should all just agree that both Rockie AND B208 are awesome. I mean, not quite as awesome as Chris Hadfield or PilotDAR maybe, but still pretty awesome...
"People who say it cannot be done should not interrupt those who are doing it." -George Bernard Shaw