That a lot of the ideas we eventually see in season 7 were already being kicked around in the prior season is attested by Statistical Probabilities especially, but, I think also, The Reckoning. So... I think that makes sense. Getting the Romulans involved was the one trigger that was pulled, brilliantly, in season 6. The Sound of Her Voice works ok, imo, as a kind of "calm before the storm" sort of episode, a little like In the Cards prior to Call to Arms, though that one is more comic, while this one has a contemplative/ominous vibe. And the season finale does deliver, though perhaps not in spectacular fashion. My only real issue with it is that there has been too much of a lull already, in this season. So, we didn't really need a contemplative/quiet episode at this point.