Maybe something that can be done if it hasn't been done already: semantic analysis across the different platforms they communicated on, to determine if it was t

Maybe something that can be done if it hasn't been done already: semantic analysis across the different platforms they communicated on, to determine if it was the same person. Also semantic analysis on the same platforms using different cohorts of time (days of the week, months of the year, quarters, whatever). Also: analysis on the email chains they interacted with. It's a possibility that they may have responded to their own emails in their mailing lists with fix suggestions/requests for clarification etc.