Personally I don't think it's a matter of trading in one human for another but rather some cats are more attached to one person. I know it was that way with Neely. Four days after we adopted her she came down with a nasty URI that had been brewing at the shelter. I was the one who took care of her until she was well and I think she never forgot that either. However, towards the end of her life she found comfort in sitting on my husband's lap. i'm glad she bonded with him even if it took longer than expected.was curious are cats loyal to there humans lol i mean like do they ever trade in the favorite human for another lol