The Federal Trade Commission last week gave the green light to Exxon’s acquisition of Pioneer Natural Resources. There was one condition attached to the approval of the $60-billion deal: that Scott Sheffield, the former CEO of Pioneer, does not join the combined company’s board. The FTC alleged that Sheffield had colluded with OPEC and OPEC+ members to limit production and increase oil prices. The allegations shook the shale oil world, where several large consolidation deals are awaiting the trade watchdog’s approval. Now, the…