For anyone following this thread, you can find "paired-tops" discussed on pages 44-48 of Quinn's book
The Complete Handicapper. I think it's a fine book and recommend it.
If you want to read the pages but not buy the book, you can find them here:
http://books.google.com/books?id=Au-...0quinn&f=false
And finally here's a DRF article Quinn wrote on the topic some years back that focused on Big Brown:
http://www.drf.com/news/what-follows-good-pair