Different release schedule = completely different behavious OS.November =/= May it's that simple. Doctor strange is not a good comparision because it was obliterated by Fantastic Beasts and Rogue One in overseas markets. Doctor Strange had about the same WW total as Guardians v1 despite having nearly 35M larger opening in WW markets. That should be obvious.
Comparing GotG1 and DS in such a simplistic way makes no sense at all.
If one movie only opens in Japan, and opens to 3M, and hen opens in every other market WW the next weekend, it can still do better than a movie that opens to all markets at the same time and makes 200M OS OW. Despite having a nearly 200M larger opening, the 2nd movie can still lose OS. So your example proves nothing whatsoever.
Also, you're saying "November =/= May it's that simple", and then go on to compare a november movie to an august movie. Well, I don't know if you've noticed but November =/= August either.
If you don't think there's going to be at least a 80-100M increase over the first film in overseas market then you are out of your mind. It's going to outgross the WW total of the first film by next weekend, it's already at 383. Unless the floor drops out this weekend 900M is a lock. I don't see how that's possible comparing it to performances of similar Marvel films in the same time period. Good greif TASM2 which was universally panned made 504M overseas on nearly the same release schedule.
We'll see who's "out of his mind" when GotG2 doesn't make 80M+ more than GotG1 OS. Because it clearly won't.
And one simple look at TASM2's OS numbers made it pretty clear it was opening much bigger OS than GotG2. TASM2 made 72M OS on it's 4th weekend, with 404M already in the bank. GotG2 made only 52 M OS on it's 3rd weekend, with 384M in the bank. Clearly GotG2 is at a severe disadvantage in this comparison. Critically panned or not, TASM2 did well OS.