If Sumi or another entity would (will) be entering a JV agreement with TLG where it acquires a significant majority ownership stake in the property, pays for the majority of the initial capex, and will be doing most of the mine build work, it may be better if TLG just sells the company to the entity now at say a 30% to 40% premium as the investment community may come to the conclusion that TLG won't be able to reap enough of a payoff once the mine starts pouring ounces.
From what I've seen to date, I don't think it's in the best interest of TLG shareholders to have JR and his team lead the mine build process for the next two years as delays and/or going over-budget can hurt the share price and keep it down. That said, from all indications to date, JR seems to be focused on a JV agreement. If JR was going to sell the company, I think that would've already happened by now. Interested parties could've been in a blackout period, taken a look at the (almost completed) DFS, and negotiated a selling price. Instead, JR has been delaying the DFS, seems determined that TLG release it themselves, and has given no indication I'm aware of that he has any interest in selling the company.