I was like, the happiest person in this thread when NA went to no.1 on iTunes, I'm only worried when it showed the signs of Crack a bottle path: peak high then decreasing fast right after.
Like you said Drake only went to like 13 on iTunes, but he got the radio on lock, that's why he don't peak high but he has longevity. So until there's some good signs towards NA I won't be able to change my prediction.
Drake is 32 on Rhymitic Radio
Eminem is 37 on Rhymitic Radio
Eminem is 50 on Top 40 Radio
Drake has got no adds on top 40 yet