I'm not sure if Rhylan was the worst of Paisley's mates, but he was somewhere at the top of the list.
She agreed to go with him at the end of the last book, so what did he do? Magic-ed her unconscious and changed her into skimpy negligee. To add insult to injury he chained her to a bed after she regained consciousness, chaining her in a way that she was completely bared for his perusal, then teased her to a point she was begging for release. Then he called her a slut and fucked her.
What with the slut shaming in this series? He was the second guy to call her a slut while doing everything in his power to turn her into needy mess before she surrendered to his whims.
I thought Vrix and Finn were bad with the dubious consent, but Rhylan used her while she could barely move and couldn't fight even if she wanted to. And she was conflicted at the beginning of their smutty scenes, so it felt icky as hell. Oh, and he was the guy who picked her for the Hunt, he wanted her as his mate and he called her his human/mortal pet, very fucking romantic...
We also saw Vrix again, he was a bit of a monster, but finally he seemed to turn on his brain, he was regretful for being rough, asked if Paisley was okay and pretty much promised to be a good mate, so he grew in my eyes a little.
So once again I have the gripe that this is tagged as a romance, not erotica and that it should have a tag "Dark" somewhere, because not one of the guys was a love interest, they were all just fuck partners, there wasn't any romance and they were all a bit too toxic or openly abusive towards they supposed chosen mate.