My repress and compartmentalize was what could be a reason what happened with the sundered when they were just 1/14. Not that Hythlodaeus or Emet needed to do so when we met. Yes it was one moment under special circumstances and yet it is a moment where not even the echo was able to allow communication. Where it could also be similar to how there was an unable to communicate problem between the three unsundered and a traumatized 1/14 sundered.