I'll just say that after opening weekend most people and media outlets were predicting Endgame was going to beat Force Awakens domestically and Avatar worldwide whereas I (check the will Endgame make 3 billion thread) predicted CORRECTLY that Endgame wouldn't even come close to beating Force Awakens despite the early lead and it would be iffy it beat Avatar. Current estimates now are that it will finish about 70 million behind Force Awakens domestically and if it actually overtakes Avatar it won't be until September.
For whatever reason I find interest in watching movie profits and takes and I look at boxofficemojo and all their charts frequently. Thus I know the 1.5-2.0 rule of thumb for worldwide takes - it varies because different countries, especially China, have different licensing fees to show movies there and different theater takes. Plus marketing on movies like Endgame is extreme compared to a movie like Brightburn.
Lastly your Deadline article is EXTREMELY inaccurate because it only considered domestic take. Movies are worldwide now so you have to consider worldwide take - for instance Endgame has made 70% of its money overseas. So leaving it out as Deadline did basically means they don't care about reality whereas I'd rather talk about the real numbers which after yesterday is 18,902,128 for Brightburn, a movie that had a six million dollar budget. Thus its already at triple its budget. It will experience around a 55 to 70% drop this coming weekend which will add another 5-7 million to its take worldwide which will put it squarely in the 4 times its budget range. It will then make another 3-5 million worldwide over the rest of its run finishing out somewhere in the 25 -29 million range most likely. Horror movies tend to have huge drops from 1st to 2nd weekend so 70% might be reasonable but on the other hand its also sort of a super flick which tend to have 50-60% drops. Exactly where it ends depends on which it plays closer to.