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You will have no time in 3 or 4 feet for a small drop to "catch up" to a larger drop. The collisions are caused only by a later drop colliding with the spout of an earlier drop.
I've noticed no drop collisions w/o reflection. If one has two successive closely spaced drops, one may cause them to collide if the first is larger. The smaller will catch up and likely coalesce instead of shatter.