Gregory can definitely do 25k so surely he'll be a number 1.
Katy is hard to predict. I think she can do 14-16k in first week but probably not more. And i'm afraid that she'll have a Brightest Blue type of chart run after that...
Disclosure will do 13-17k. Certain top 3 maybe even number 2.
Dua I can't see beeing a big contender but she should do 6-7k.
The Killers will have 7-8k. They can stay in top 5 but it'll be very close with Taylor, Pop Smoke and maybe some other new releases so i'm not 100% sure.