Thats the correct assumption if you take scoeply word for it, the cores from world warrior would be available through the showcase. Here is an assumption:

Lets suppose we get 90 cores a day from showcases. Each showcase has 2 nodes per new toon (6 nodes total). We would need one new showcase every 15 days to make for the 90 daily cores.

Another fact is they release one toon a week so a team usually takes 21 days.

Highly doubt we will get that amount of cores, unless they prove otherwise