Honestly, I wish they'd just bloody decide on how the old gods are supposed to work or at least stop giving us information before they actually settle on what theory they're going with. How many contradictory statements have we had about the old gods by this point?
The ones I can think of:
Number: There's three, there's five, there's five major and several lesser, they are as countless as the stars
Location: Found only on Azeroth, found throughout the universe
Danger: The old gods sealed beneath Azeroth would threaten the very universe if they broke free and only the united might of the titans was able to seal them away, there's old gods throughout the universe that are constantly getting killed by the titans
Killability: They can be killed but it would destroy Azeroth, they can be killed without destroying azeroth but their spirit would live on, they can be killed and many have been
Worshippers: The old gods are virtually unknown to all but a few dark cults, the old gods have many minions but most have been sealed away (admittedly, these first two can work together), the old gods have servants on every corner of the planet