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I think, if anything, we can conclude the fact that CB has been operating for quite some time. The founder died "200" years ago, after all, and Setsuna encounters a Gundam in the prologue to Episode 1. Moreover, the other Gundam Meisters mention that it's Setsuna's first battle mission in Episode 2... we could probably assume the other Meisters have had previous missions, and Setsuna is the newbie.
The fourth was probably either destroyed, or just hasn't been introduced yet.
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