I totally understand that too...I don't THINK that any of them are quite smart enough to pull it all off but what if it was just a "simple scare" that turned bad. Maybe they thought that RC would just call CS and accuse her and say..."yep! i took my child out of that house without you knowing because NO ONE WAS HOME with her"... when that didnt happen, the plot thickened. ***Remember JS lives in Satsuma...***
Interesting theory. I guess, for me, it just boils down to I don't think the Sheffield's really cared enough about those kids to bother. They were out of sight and out of mind and Crystal had her new baby.