I would not redirect it to "drop in the bucket", as "drop in the ocean" and "drop in the bucket" are terms that differ in one word, and we do not have redirects for alternative spellings that differ much less.
Moving to "drop in the ocean" seems okay, but I am unsure about this.
I admit that I am not sure whether the terms that I have listed are in analogy with "a drop in the ocean" in these regards that recommend the moving, as I am not sure what these regards are. --Dan Polansky 10:37, 25 December 2009 (UTC)
Yes to your first point: I should have offered alt form of drop in the bucket as my suggestion.
Some of them, not all (certainly not a into g), should be moved. I have looked at some of them and not been sure. Little harm comes from having them because the form with "a" is usually the most common, some times overwhelmingly so. For example, "little birds told me" is attestable, but raw bgc hits favor the singular almost 50:1. DCDuringTALK * Holiday Greetings! 12:17, 25 December 2009 (UTC)
I think they need to be handled one at a time. DCDuringTALK * Holiday Greetings! 12:22, 25 December 2009 (UTC)