Cain and LeDuc certainly aren't new to skating or in their early teens, but they've only been skating together for 7 months. I think it's fair to say they have some potential.
But individually they are as inconsistent as the rest of them. Their elements are also not good. Look at the score sheet. It's not like C/T did worse than them in TES as terrible as C/T were.
New partnership doesn't improve individual inconsistency.
.... I'm not saying Mervin and Marissa are a better choice, but if I were the USFSA I would have taken some more time before making any decisions