Well, as in many games with novels tied to them diablo games series spwaned the novels no the other way around
In this particuar case you cant see such fluid/transparent flow of events to macht each other is just a blizzard thing, they just dont do it, most of it is there to fill the game, with minor influence in the upcoming end of things only mayor quest will do perform such impact in the game and most of those will do have coorelation with the lore that you could find in other sources
Somethings will not look plausible as you said, but remember in what "Universe" does this things happend you have to put things in perspective and even so things still will not look clear but thas how this works so accept that.
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In this particuar case you cant see such fluid/transparent flow of events to macht each other is just a blizzard thing, they just dont do it, most of it is there to fill the game, with minor influence in the upcoming end of things only mayor quest will do perform such impact in the game and most of those will do have coorelation with the lore that you could find in other sources
Somethings will not look plausible as you said, but remember in what "Universe" does this things happend you have to put things in perspective and even so things still will not look clear but thas how this works so accept that.