v15 Emails attached to orders vs Merging

So I guess in v15 email addresses are no linked to orders, rather than being directly written out in T_ORDER?  My memory is fuzzy.  Anyway, we are having a problem with this when we try to remove duplicate email addresses when merging: 

Has anyone else stumbled on this, and does anyone have a solution?  I'm assuming I'm going to have to add some merge rule to find duplicate email address, choose the keep email address, and then re-point all the customer's orders to that new address?

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