As always, search for "TL;DR" for the summary.
When converting the judges' scores to ordinal points:
Ally & Sasha: 6
Kel & Witney: 5
James & Emma: 4
Hannah & Alan: 3
Lauren & Gleb: 2
Sean & Lindsay: 1
If that is then converted to percentages (like it is now), the spread becomes 23.81%.
Under the current scoring system, Sean and Lauren were separated by 4.8%. Under the old scoring system, the separation would only be 4.76%.
Also, if Sean got all 1's from the judges this week (8 points instead of 50), the total spread (under the current scoring system) would be 16.71%.
TL;DR:
Spread under current scoring system: 7.19%
Spread after converting to ordinal points then percentages: 23.81%