They would only "retire" them as in exchanging them for Preferred Shares, which would not only maintain their voting control of the company (Preferred shares have more voting rights than Common), but would also be exchangeable back into common shares of the company, based on a prescribed formula with accompanying conditions.
Retire the 300mm and the 400mm O/S reduces to 100mm 100mm X closing price and changes nothing with regard to what value the Auditors place on this story.
Gives the Market cap a new undervalued price. Like TGLO needs to sell shares to do anything?
Preferrd shares will be cashed in when Exxon buys this out. Or Shell. Or BP. Or Marathon.