US v. Google: do complaints have to be internally consistent?

From former DOJ Economist Greg Werden: 

The governments case suggests that its exclusive deals with Apple and Mozilla to be the default search engine on their browsers “allowed Google to maintain its monopoly power [in "general search"] in violation of Section 2 of the Sherman Act.”  

However, the government's brief also suggests that Google's scale is very important, which implies that its scale economies--not its exclusive deals--that maintain Google’s dominant share.