Unanticipated that Samsung would freakout at a competitor directly from Google itself?

I remember a lot of talk about Samsung's Tizen operating system around then, so the most plausible explanation to me was that Google bought Motorola specifically to keep Samsung inline with a more stock android, end results hold up to that as well.

Of course it's always hard to figure out cause and effect, but Google never even appeared to go all in with Motorola on hardware beyond the initial purchase... smelled like a ploy.