My biggest issues with the rankings are:
1) Whitaker being ranked 8th, and behind Oscar. That is just insane. I can see a case for Floyd, Sweet Pea, JCC, and even Roy for #1, but I can't see ANY argument for Oscar to be ranked higher than any of them.
2). Oscar being ranked ahead of JMM, Finito Lopez, Evander Holyfield...etc. Oscar was a great champion who fought all of the top fighters, but he lost many of his big fights and was given controversial wins more than once (Whitaker, Quartey, Sturm...etc.), no way Oscar should be ranked that high.

As for BHop, I can see a solid case for ranking him over Roy (I have him ranked higher on my list), and in the top 5. People rank Roy based on one of two criteria: his potential/freakish athleticism OR his actual in ring accomplishments/historical significance. If you rank him on how he looked in the ring and his natural gifts, you rank him close to the top. If you factor quality of opposition and historical significance, guys like Floyd, Manny, Sweet Pea, BHop, and JCC come out ahead.