I am not a lawyer, so this is only my opinion. This is my understanding of the trademarks surrounding the words android and droid:
Google owns one of the incarnations of the word Android which they inherited from the company that was named android (which came up with the operating system). Now, android seems like a very generic term to me, so it is unlikely Google owns all of android; I believe if you make an operating system for smartphones and name it "android", then you might get into trouble.
Doesn't Lucas Arts actually own "droid" for a trademark? . Verizon named their phone the "droid" and the phrase "droid does" possibly infringing on Lucas's trademark. However, I don't think Lucas Arts is suing Verizon for using the word "droid". I think George Lucas' original intention for "droid" was actually was incarnated in Edutopia.org. If you haven't seen his site, go check it, he is doing some really cool stuff with it.
As I understand, many android apps have the word android or droid in them. I doubt Google nor Lucas Arts nor Verizon are suing the app developers that actually are growing the value of android based technologies.
So I don't believe there is any wrong doing in most of domain7's domains. The one with the Verizon and T-mobile are pretty intrusive into their marks. If I were you, I wouldn't even park the "verizon" and "t-mobile" domains, and just delete them from the registrar's account.