> Google was absolutely trying to achieve interoperability with Java
I don't think this is such an easy argument. Google's interest was ultimately the bottom line.
Without discussing the copyrightability, from a strictly monetary perspective, APIs are product that, in this case, has a very high monetary value (market share == $$$), and Google chose it for this very specific reason (developers == market share == $$$). Again, I don't imply that copyrightability is good or bad, but the entire matter has been about money, and strictly from that perspective, ownership has a sense.