You still didnt explain why Pathfinders perform better at vet 0.
I mean, i do like Pathfinders, but they seem to be worse in every single way for pretty much the same price and inability to be called in from houses.
They do more damage at close and medium ranges, and the ability to instantly kill a infantry unit under 40% health is quite powerful and they can cloak at vet 0. They also get slighty better bonus's in the early vet levels:
Pathfinders:
Vet1:+10% sight range
Vet2:-20% weapon cooldown, -29% received accuracy
Vet3:+14% weapon range, +20% weapon accuracy, camouflage stays shortly after leaving cover
JLI:
Vet1:Unlocks the 'Field First Aid' ability
Vet2:-29% received accuracy, passive cloak
Vet3:+40% accuracy
Ultimately they are pretty even in usefulness till they both hit Vet 3 and JLI become objectively better; not really a flaw, they both cost/function the same till JLI out Vets pathfinders which is how most OKW units work anyway.