I think it was a test and Randell just passed it. Trump had been saying he wasn't sure if Randell was tough enough, so he threw him in a horrible position to see how he'd handle it and I think in Trump's world he passed. Because in Randells position, Trump would've done the exact same thing, he didn't get to where he is today by playing Mr. Nice Guy and sharing the spotlight.
I do think it was a pretty crappy thing for Trump to do though, Randell was so happy celebrating and then BAM he puts him in that position, sorta takes away from his win. Not sure what I would've done.
I'm sure Rebecca will do just fine, she's amazing and at only 23 it's just mind boggling. She'll be a huge success at whatever she chooses to do.
Just a little disclaimer....these are just my thoughts and opinions, I'm not looking to get into a heated debate.