But even in that case the relationships weren't completely broken. While 过 changed, 娲wa, 祸 huo，涡 wo，窝wo，锅 guo，蜗 wo，etc. still share the radical to the right,

But even in that case the relationships weren't completely broken. While 过 changed, 娲wa, 祸 huo，涡 wo，窝wo，锅 guo，蜗 wo，etc. still share the radical to the right, and 过 is a very common character, you shouldn't need to guess how to read it.