I have a few questions regarding android source code download, repo / git.

This page says that The source download is approximately 6GB in size, but when I downloaded my directory size is 11GB. What did I do wrong?

I downloaded the source code using
repo init -u https://android.googlesource.com/platform/manifest
Does it download source code for all versions of Android? If so, I don't see separate directories for different versions. How to check/list all available versions?

And what would have changed if I had used
repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1 instead?

Also repo branches outputs (no branches)

android android-source
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