Just to give you my minority view (often happens to me), I don't think there was anything wrong with Randall's refusal of Trump's question about hiring Rebecca. It wasn't just hiring her. Randall apparently took it as sharing the apprentice prize, hence his remark about "no apprenti" (which I thought was pretty clever for an off the cuff remark!) The prize really isn't his to give - its Trump's, which is why I thought it was so unfair to put Randall on the spot like that.
Why should he share the spotlight when it was something he had worked for? Trump may hire her anyway.
Over the weeks I think Randall's fine character and sensitivity as well as his fine mind has come through even in the edited footage we see, and to my mind he is the best qualified apprentice ever.