What? Whaaat?.... Then why wasn't I givin this advice when I was catching 7 swarms?

Crazy- ""I was reading on a Facebook beekeeping question group about how people are losing swarms that they caught. One beekeeper said he has stopped that from happening by finding the queen and caging her for 3-4 days. Has anyone tried this?""
The missing piece to this question is:
If a hive has swarmed, they have left behind capped queen cells. So, if you remove the queen and cage her up to 3-4 days, then the new queen/queens are going to hatch out in three days... and then you put the swarm queen back in...
So, it's either a fight... or they swarm again...
So, why is my situation considered a genetic problem?