My completely self-serving vote would be : restart, either with Blackguard or a new 7th I don't care 'cause my startpos is beyond crippling
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More seriously, I guess it's up to Blackguard if he wishes to go on with a stale first turn or not, with the sizeable impact it can have on early expansion especially for Vanheim.
If we don't hear from him and he ends up staling the second one too, then I think he'd understand if we restarted with a new seventh player though.