You are mingling a bunch of points.
Linda kept nwbo afloat over a decade ago. - Agreed
Open market buying does not provide cash to the company. - Agreed
Linda's recent $5m was a loan, not an equity investment. - Fact
The deals with Cognate can be understood if you read the notes below the ownership table in SEC filings over several years.
The OP was trying to make a "skin in the game" argument for Linda based on the recent 5m. That I dispute as her position is not nearly as at-risk as nwbo longs.
Linda Powers manages nwbo as if she deserves an ongoing 50% interest regardless of how many shares she sells to others. There has been a persistent pattern of dilution, followed by some transaction (share gift, options, Cognate deal) that miraculously bumps her back to half ownership. Saving the company a decade back does not entitle her to half the proceeds regardless of other people's subsequent financial contributions.