What's your citation for the notion that post-acquisition changes never happen before the deal fully closes? I grant that irreversible structural changes are ra

What's your citation for the notion that post-acquisition changes never happen before the deal fully closes? I grant that irreversible structural changes are rare, and cross-company integrations of course can't happen. But here this isn't one company acquiring another, and it's just changing one exec. Maybe you're right, but I've never seen anything showing that.