Ashley Cain and Tim Leduc are pioneers!
They created a trend, and like many trailblazers, they took the heat. The way some FS fans talk, Ashley and Tim have a permanent handicap. C-G/L, however see it as a challenge they work on, and they embrace it for the advantages it offers. Now there's a rash of more girls closer in height with their partners. I'm glad to see it. I think it's good to push the boundaries about what a pair can look like.
Sasha &Danny do seem close in height. So are Kate and Balaz. I've always thought so, and Wiki says Kate's 5'4" while Balaz is 5'9-1/2." That's 5-1/2" difference. People have been moaning for years about A&T, who have a 7" difference!

Evelyn Walsh and Trennt M. are also closer in height than A&T, I think.
It's funny, too, to see Dalilah accepting these newly paired couples. Alexa Knierim said that when Dalilah accepted her, she told Alexa "you're too tall" for any of the American boys, we'll have to look outside the country. Alexa is 5'2." Then Chris became available, and the 12 inch difference was acceptable. Dalilah also broke Rockne Brubaker up with his junior partner Mariel Miller, citing lack of height difference that could lead to injury, according to my friend Wiki.
I wonder if Sui and Han's successes have had something to do with this change in attitude. I've been watching pairs skating recently from World championships in 2012, 2013 and 2015. Pang and Tong were closer in height too.