So, again, it's clear that the technical requirements of pairs skating were much easier for her. It's been the exact same case for so many other skaters too
And other skaters tried out in pairs and didn't find it easier, so you never got to see them skating pairs. It doesn't always work in the same direction, but you only see the direction that works.
How are you defining success? Jumps landed? Results/international assignments?
The numbers game can work with results without changing disciplines. Some skaters change disciplines to have a better chance of getting to Worlds. Some change countries to have a better chance of getting to Worlds. No one would argue that it's easier to land a triple loop representing Azerbaijan than it is representing Russia, but it sure is easier to get to Worlds that way.
So IF you have the ability to change countries, you can have a better chance of getting those opportunities.
For other skaters, IF you have the right body type and temperament to change disciplines to pairs and can find an appropriate partner, you can have a better chance of getting opportunities that way. Not because you're any better as a skater, but because there's less competition.
Here's a skater who had all the standard triples, although as we see here she wasn't consistent with the triple lutz:
http://www.youtube.com/watch?v=zIZ_ZkII2iY
Here she lands side-by-side triple salchow in a pair program:
http://www.youtube.com/watch?v=RuoGMUdgHM0
What skating pairs did was allow her to compete at Worlds a couple of times. But she didn't like it as much as she liked skating singles, so she quit pairs.
As it happened she grew enough during the following year that she struggled with jumps and didn't make it out of sectionals. If she'd continued skating pairs, she still would have had the same jump struggles, but the team would have gotten to Nationals because there just weren't that many other pairs around who could also do the elements. Well, actually, they would have had a bye and GP assignments based on results from the previous year.
Skating pairs didn't make her a better skater or any more likely to land the jumps, although it did help her cover more ice on the thrown jumps than the solo jumps.
Oh, and I'd offer
Galina Maniachenko as a skater who switched from pairs to singles with reasonable international success.