Larry,
I spent 7 years as a wall street stock trader. The financial process you are describing is called a Rollup. Your idea has merit, but, like my idea, we're just taking our best guess.
ATC is not buying the properties, Cox Enterprises is. Cox Ent. is privately owned MEDIA EMPIRE that includes newspapers, television, radio, cable television, CEllular Service and other businesses. ATC is one small part of the Cox Empire. Cox has no active history of rollups, but, the primary owner of Cox Enterprises is Anne Cox Chambers and she's almost 90. A IPO from the Cox Empire would be historic indeed.
If your roll-up scheme is true and Cox is looking to go public, then this isnt the only buy Cox has made. You'll get confirmation in seeing Cox buy up many other smaller properties to improve it's diverse portfolio. If you then see other buys, you have to factor in the Tax bonus sellers are getting that would fuel this wave of acquisitions.
That being said, if this is a Rollup, it sure is a strange one. Rollups often bring many small players together to share common resources to inflate profits. I don't see a lot of overlap as all three are really unique models.
Lastly, the Cox's are no different than Mr Biter. The tax impact that helped force Dale P and Jesse B to sell is what the Cox family will be dealing with.
If I were called out to make a bet, given the Cox history and it's gigantic empire, I see this as further diversification in the massive Cox Empire.