Possible, but unlikely in my opinion. I don't think his pressure is as effective as Calzaghe's. He's not as quick, his handspeed is pretty slow, and Hopkins won't tire as quickly because its far easier to circle The Road Warrior Johnson is also a very very slow starter as seen against Dawson, he'd probably lose the first 5 when Hopkins is at his sharpest. It's a long way back from there. Just my opinion of course.
Bute :think I think I rate Bute correctly as it is - consdering what he's done and what he's shown skills-wise. I think he's pretty good, but not as highly as you rate him obviously. I think he'll beat Andrade, unlike some.
Glen Johnson by UD. In 2005 Hopkins was past his prime which was evident in his fight against Howard Eastman (http://www.youtube.com/watch?v=JqlPY746k2A). A 2004 version of Hopkins when he was much busier would beat Glen Johnson.
Also in 2005 Hopkins would lose to Jermain Taylor twice, which is further proof that Hopkins was already past his prime.