I tried to adapt MLB's "games back" metric in the spreadsheet I used for my announcing. I'm convinced that it can work, though not that I did it yet.
I used RP since wins isn't as valuable a metric.
If PRP is the total number of ranking points possible (4 * number of matches played) for a given team, I computed (2 * PRP - RP) for each team. I subtracted each team's total from the leader's and divided by two.
This might be entirely equivalent to dividing a ranking score by the number of games, or there might be more happening there, but it does make those teams that are trailing in the rankings because they're a match behind pop out without a lot of searching.
edit:
https://en.wikipedia.org/wiki/Games_behind