I scraped through the Challengers signup team list for NA, and I confirmed a couple of things.
- Will is playing with Dark Ratio, and they've signed up as Dark Ratio which means they aren't signed by Mad Lions just yet.
- Oxygen Esports and The Nation are on the list so probably not directly invited
- The Guard, FaZe, M80, TSM, SR, and G2 haven't signed up so they are likely the six teams who received direct invites.
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