That a polygamist would decide to steal Elizabeth for his own doesn't make sense either. Most of the polygamists live in secret, and take each other's daughters for wives. To steal a girl from a prominent SLC family would bring the spotlight onto polygamy in Utah, and the polygamists do not want that. There were three polygamist families who lived in my sister's neighborhood in West Jordan (south SLC.) The day after Tom Green was found guilty of rape (he married his current first wife at the age of 13), the three families were gone, and their homes were up for sell. No one in the neighborhood had a clue they were going to leave.
I've lived in Utah most of my life, and the only time I've ever seen a polygamist man out with his wives in public was at the airport, I saw Tom Green and his five wives returning from a TV show. Otherwise, I see the women at fabric stores a lot, in long dresses, with long hair, and several children in tow. NEVER with their husbands.
Lots of things in life don't make sense. This is one area I would not discount without serious investigation.