A litigant though is a 'legal person'. if you have 2000 legal entities (ie, legally== persons), it seems to help you on the math. But your question still stands and is a good one. Its not clear what role a common "controling entity" would have, for example, on the ability of affiliates, spv's and relatives/children to file or be found 'vexatious' etc.[1]

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[1] INAL, but I think this question should be answerable.