MNLU and AEXP are already sharing a joint land / drilling deal, the only thing I think AEXP has going, and that is independent of the merger. If you are worried, split the cash between the two maybe? Other question is what will MNLU stock price do if the deal fell through? I think we are at a 98% probability the deal goes through, and this year. Just my opinion, not advise!
And that said, who would have thought BP was a risky stock to own this year?