I think if I am in your position, I will also do the same thing. Granted that Byzantine Kitty is a powerful summoner, but to exchange it with four cards who have greater battle utility, that to me is a wise move. I am actually doing the same thing, but of course at a lower level.
Yeah and I mean, Kitty is a beast. One of the best cards in the game...But the use case for other cards really helps my game.