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TTRPG is tomorrow and everybody's confirmed to be attending, so Gura is guaranteed to be there.
Also, when you actually look at The Rigger's tweets in actual chronological order and not individually, she is surprised that there's another outfit announcement so soon after previous one. You can interpret this as her being coy, but that's what she actually tweeted. Might be a new rigger after all.
Take this cope with caution, of course.