It has been mentioned that once an E/A deal will be complete there is a possibility of a takeover by another company, or at least a Bid from the likes of Shell. This is especially true considering where IOC is trading at these days.
On a prior post it was mentioned that Shell owned 25% of Woodside Petroleum.
Short of buying out IOC (or as a prelude to), perhaps a deal with XOM (or Shell), can or will entail a percentage stake/ownership of IOC. Let's just say they buy 25% of the common stock at a price of 180 dollars a share. This establishes a new floor to the pps and will make it much more difficult for any other company to come in and interfere with the SPA or Selldown of E/A. There are obviously many other mutual benefits.
This is just a thought based on what other deals have entailed that I have seen.

