Here's something I never really understood when doing these dynasty threads: how exactly are we supposed to compare these teams?I assume it's more than a simple statistical analysis, right? Because once you move past that (which has its own issues) it gets pretty dicey.The 2001 Pats were different than the 2003 Pats, who were different from the 2004 Pats. And do we even include the 2002 Pats? Is it an average of all four teams? Is it the best of all four teams?The 1992 Cowboys were a heck a lot different from the 1995 Cowboys. Deion Sanders never played for Jimmy Johnson. By my quick glance, the 1992 and 1993 Cowboys were essentially identical, but that doesn't help solve the problem. What are the "90s Cowboys"? An average of all four teams? The best of all four teams? How do we factor in their 1994 season?This was a lot easier before FA, when the core of the Steelers remained intact: Bradshaw, Harris, Bleier, Stallworth, Swann, Webster, Green, Greenwood, White, Lambert, Ham, Russell, Shell, Thomas, Wagner and Blount were there for EVERY YEAR from 74-79. The only notable departure was Glen Edwards after the '77 season.So the '74 Steelers were largely the same (in terms of personnell, not talent) as the '79 Steelers. But the same surely can't be said of the 90s Cowboys or the 00 Patriots.It's hard enough to compare the 2002 Bucs to the 1985 Bears. I don't even know where to begin when trying to compare the 00 Pats to the 80 49ers.