It's also possible that we were one of the first to develop intelligence, within our light-sphere, that is since the minimum time needed from the big bang to develop intelligence (whatever that is). E.g. let's say you need 12 billion years just to get to the point where you might be able have the environment needed to make planets. Then in our 2-billion year light sphere we may be one of the first to develop intelligence. That is, if it's very rare to develop intelligence.