Guess he knows they are related?
In this term they can only really be compared to C/B ofc.
Given Ben Agosto's long history with the sport, and his own impressive accomplishments, he knows way more about these ice dancers than anyone on this Forum, I would wager.
A partnering connection such as described by Ben certainly doesn't rely on personal attributes. It is an extraordinarily important facet of ice dance on-ice skills that any team can develop.
Jumping off, I really like Ben's commentary as well, he gives me points to think about and he is even-handed in his criticism and his praise.