Scott should have been booted a while back, then Anthony. Constantine, while a decent entertainer, would not have made it to the top.
On another note, I bet there are record producers in Nashville who are just hoping Carrie does not make it to the top, because she is good, projects a clean country girl image, and has an awesome voice. Carrie has a lot of natural talent, and with the right coaching and producer behind her, she could be a serious entertainer in the country music industry.
Bo, is another story all together. That man could rerelease some of the older classic rock songs on an album and have a very serious hit on his hands. Then while reaping the rewards from that, he could work on his own stuff and and become a serious rock and roll artist.
Anthony, he just needs to go. He has all those teen girlie girls swooning over him, but he would be the next boy band craze for a while, and then disappear.
My money is on Carrie or Bo. Both could have very successful and long careers with the right coaching and backing.