The problem is that you cannot effectively guard them because they die to fast. A smart 1-2 players will always succeed in killing a dolyak even if you have a group guarding it.
They just have paper HP.
My hope is for a third tier of supply camp upgrades that increase dolyak speed / toughness.
If your 5 can’t stop ‘smart 1-2 players’, I’d question the 5 before anything else to be frank.