Rock, before you start screaming about nothing, I'm only responding to help people who are looking at this thread, and in the process, you as well.
This has no predictive value because teams who are currently in the top five, or the 5 teams with the best record in their professional league, have either met, or exceeded expectations. So, yes, of course their current ATS record is going to be good.
If you'd like some examples:
Top five MLB records this past season: Cubs, Rangers, Nats, Indians, Red Sox
Combined units won (on 1 unit flat scale): +43.93
Top five NFL records this past season: Pats, Cowboys, Chiefs, Raiders, Steelers/Falcons/Giants (tied)
Combined ATS record: 74-40
Final top five CFB ranking: Clemson, Bama, USC, Washington, Oklahoma
Combined ATS record: 40-30
Current top five NBA records: Warriors, Spurs, Rockets, Cavs, Clippers
Combined ATS record: 119-106
Before you respond and say "You just made my argument for me, it works in every sport!!!!!!!!!!" These are the results at the end of the season. A trend that could potentially be used for some good would be something like; "Historically, the bottom 5 teams at the MLB all star break have an ROI of 4% for the second half of the season."
If there's a pattern regarding how teams perform in the future based on previous results, it's potentially usable.
If this system actually had some predictive value, you would bet every 3-0 team in week 4, and against every 0-3 team.
In week five you'd bet every 4-0 team and against every 0-4 team.
etc......