"Verse 4:3 is talking about taking responsibility of female orphans(by both men and women) to marry them off in "twos", "threes" or "fours". It's not saying to marry with yourself two or three or four of the female mothers(again conviniently added in brackets). There is no mentioning of "special circumstances" except untill a dynamic Quranic society as a whole has not been established; which will take care of orphans itself. "
Before accepting your interpretation , I would like to ask following questions
a-Why there is no mention of male orphans ?
b-Pls explain فَانكِحُواْ and النِّسَاء in 4:3