Club Rugby Elo style Rankings

So, I was looking into Elo ratings for various team sports and found a site that does a version of Elo for rugby. I know some decry the rise of data analysis in rugby, but I find the whole thing fascinating...

http://www.rugbyvision.com/

Some details on their methodology with seems to be pretty straight fifa style Elo with a rebasing to 100 rather than the typical 1500 is here
https://www.statslife.org.uk/sports/2417-who-will-win-the-rugby-world-cup

Here is their current prediction table for the pro12.

Mr Blue Sky
Please tell us why
You had to hide away for so long
(so long)
Where did we go wrong?