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Bad idea to launch 5 sites for the same company addressing the same targets. One site representing your company (if same product) is the rule.
If you can use different IPs, private domain registrars, no interlinking, different contact info, and different content you can get away with it. If you're just throwing up 5 sites on the same server with similar info you're asking for trouble.
I will be there, and looking very forward to meeting everyone and attending MozCon! See you all soon! - Irving
It sounds like you got a hold of the problem.
Verify the subdomains in WMT
Block the CDN subdomains with robots.txt
Request site removal in WMT for the subdomains
make the canonicals absolute
Keep the blocked subdomains in WMT, when you log in you will see a message by the subdomains saying "Critical issue with your site" which is just telling you that the site is blocked.. I like to keep it in there so I can see it's still blocked.
Nofollow all of the links between your sites and you can cross-promote all you want, safely. Link sitewide, in the footer wherever you like as long as they are nofollowed. .
If you are doing it for SEO though, I would probably not do that unless the sites are hosted in different places and ownership is not exposed. If they are completely separate you can one way link from the homepage (homepage only is best because it's always spidered and the homepage usually has the most PR) of the lesser sites to the main site.
It sounds to me though that this is for cross promotional and not for SEO so just nofollow them since that is completely safe. Just keep in mind that each place you nofollow a link to your other site you throw away a little bit of PR that would otherwise be passed to your internal pages.
The most important thing to remember is that keywords in folders do not help push rank, keywords in filenames do.
So if you want a folder named /utc/ because it makes the site structure more logical than do it, but understand that it's not helping rank for "utc"
Therefore, in my opinion this is best
www.eteach.com/talent-pools-at-utc
this is acceptable
www.eteach.com/utc//talent-pools-at-utc
this doesn't target "utc" for SEO
www.eteach.com/utc/talent-pools
and hyphens are better than one word or underscores