Forget the numbers/rankings. Case in point, Andre Dirrell. A close win over him as a 'top 15' SMW at the time, versus Bute's dominant win over a 'top 15' SMW in Miranda. Does that make the Miranda win better? Of course not. Dirrell was only rated top 15 at best because he hadn't stepped up, not through ability. It's clear to see ability wise he's a top 5 SMW and was the same talent wise against Froch. Hence it's essentially a win over a top 5 SMW, not a top 15.
Agree with you for you assement of Dirrel an Kessler, but not on Bika. Bika was nowhere in the first 7 of SMW (some even put Green and Stieglizt before him) and now he lose to Ward and he is no. 5? Theres a case to put Andrade before Bika too, so for a lot of people Bika was on the end of top 10 and some outside of it. I'm not saying they were right, but a lost is still a lost. Either he was above Abraham in the begining of the S6 and still his, or he was behind him and still his.