He specifically said "if it doesn't die to weather damage in 3 turns". Considering Trade Posts start with 2 Econ, it could die in turn 1 since Weather damage goes up to 3 from what we know, so two Main Supports(one in the same turn as the founding) sending 4 Econ would ensure it does not die...but it eats up Econ AND the Red Banner, which gives us nothing to contest the Trelli when they start raiding.He did no such thing. He said they would need three turns accommodate to the different weather and the Red Banner to assist.
In turn they would help us prepare against the Trelli by giving us better construction material. It is specifically what they would be sent to do.
None of which would pay out until 3 turns in at least while it gets set up. That the Northern Trade Post gives good materials is uncontested. That it would give us the material in a timespan that matters to this issue is. If they take the Western Trade Post spot we basically don't have any option left but to beat them at sea in an offensive war.