The two details that best suggest that Isaac sees Mariah as an overly cautious player with a weak gaming strategy are:
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"What do you want to do, Mariah, stay hidden forever? We're way too far from the portal."
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"Nah, with hardly anyone left, this will be easy!"
These statements indicate Isaac's perspective that Mariah's cautious approach is excessive and that he believes they should be more aggressive in their strategy instead.