Stay is really going to need support from another format or the airplay run is going to be quite bland. Rhythmic doesn't seem to be bothering with it, especially with PIU there.
That's not really a 3,5 million update. As you see the song is marked in red in Kworb's site and that means that the totals now include a new format where the song started charting so the whole total of the new format is added in today's update. Hope you got it
I'll peak at #2 on Pop, I'm sure of that 
Finally coming for a Hot 100 peak? 
