Although I'm glad Damien is keeping Katden, Harrison is a bit heartless talking about it in front of the little guy like that.
Harrison is also very naïve (I thought that was better that absolute idiot ), of course a slave is not going to accuse a master of hurting him and so of course Kayden was not going to admit to being hurt. Even if it had been another slave hurting him, he is new to this household and doesn't know the dynamics, he would be stupid to accuse anyone of anything.
I think Ellis is going to be a good help but I do agree that he should have noticed the blood on the clothes as he was putting them into the hamper.
On wards I go