GP 2010 is *not* officially supported on SQL Server 2016 CTP. SQL Server 2016 itself is not officially available for consumers yet. It's not a wise idea to run production GP on a CTP grade SQL Server.
Considering that you had already tried and found that it's working. While it works fine now, the real pain would be when you want to upgrade GP2010 to the latest version.
GP Utilities will fail to run on a non-supported SQL Server.
Hope that helps.