I don't think Solberg was in our worst 20 defenders. Guys like Ifil were worse. Solberg was slow and got caught out a lot, but he could actually trap a fitba.
Bus only started three times for the Dons. He started alongside Diamond once, and I think Considine twice, but it might have been Severin for one. None of those would fit in a worst ever partnership, despite Bus dragging them down. Jimmy C gracefully gave everyone a shot with him too, so partnership couldn't be accused.
I'm starting to think Gallagher and Bates are in with a shout, even though I think they were unfairly played in the wrong side continuously, like some sick joke.
Edit: speaking of sick jokes, when Bus played for the Dons, the fullbacks were McNamara and Maybury.