I truly believe T-Swizzle can break or match the record tbh. She really is a force and has been coming stronger and stronger with each album. I mean, let's just remember how much IKYWT did in its first week JUST as a promo single.
Adele is also a possible breaker for the record, although as many said, I doubt she will do as much as people expect her to, no matter how much anticipation and hype surround her.
Out of those, no one will touch the 1M mark 1st week, not even Em. So, it'll either be Swift or Adkins. Simple facts of life girls