bad source in the distro iso's

[Trever]

I noticed in 7.2 that the /usr/src installed from the ISO downloads would not build without first sup'ing for a few updates.  (disc1.iso's)

I notice in the 8.0RC2&3 that some of the source files are corrupted.

Not a media issue, checksum's have always been confirmed good.

Is this normal, for the packaged source to be "bad"?

One of the nice things about BSD is that it comes with everything to build itself, but if the source won't build without first updating... 

Just curious.

Trever