User blog comment:Jkphantom9/OFFICIAL: Japanese Cast Announcement!/@comment-25555436-20150609194140/@comment-4010415-20150609204339

RvB season 11 started in 2013, so that's when Lindsay started voicing Vanessa Kimball, albeit for one episode. Kimball started getting more of a role in season 12. I didn't even realize that she was voiced by Lindsay until I read that she was.

Felix also debuted in season 11, and he's voiced by Miles Luna.

Arryn voices Dr. Emily Grey, who first appeared in season 12, which started in 2014.

Kerry voices Palomo, who also first appeared in season 12.

Barbara voices Jensen, who first appeared in season 12.

In the case of those guys, it isn't so much that they're more used to their roles in RvB.