In all honesty, I can only see this happening before drilling. The suitor would want the glory of drilling to make their shares increase in value. However, Offor seems to be good at making solid deals and would use this timeframe as leverage IMO.
It would almost have to be Addax. All they would be doing is increasing their "company making assets" and aquiring a pitbull like Offor to sit as a consultant of sorts.
Where do I sign again... This is the outcome I am looking for and it seems Addax has positioned themselves quite well to make this happen.