Pentatonix won't take number 1 from her
She's still technically number 1 on iTunes and on amazon and she's probably beating them on physicals as well. So, they won't be able to cover the rest of that with a song that JUST on Monday is exploding to number 1 and won't even outsell Closer through the week. They'll probably snatch that #2 from Michael because their predictons were pretty similar but they'll never cover all that ground Gaga has over them just with SPS. I mean, for all that's worth Gaga is selling more than Hallelujah when you combine MR& AY at the moment(but this will change) Unless they somehow sell 300k copies of Hallelujah in like 3 days there's nothing to worry about, and nobody except Taylor Swift or a few others can do that.