@throwaway4ccount Here is why I think most of the explanations (minus the magic boost which is quite recent) would be whisked away... because he came from another world, he had no magic. Because he had no magic, anything that should effect magic would not effect him. Barriers that repel magic won't work. Stones that absorb magic won't harm him. He had the classic Isekai trope of getting a special power (in this case, being loved by spirits) which explained things. And people dying to transfer is such a common trope that it wouldn't register for most people.
Think about it, this is a trope where summoning is either magically being summoned or dying and then appearing somewhere... something so common in this type of series that being in another world after death means nothing.
And that's why it's a shock to readers. Because almost anything noticed is quite normal in an Isekai... he had a gift and he had no magic. These 2 things boosted together could have made a huge difference.
Plus, the fact that he was contracted to such a large amount of spirits could also explain why he could boost the magic of others...
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Having no magic and having a gift (which is normal in an isekai) that allows him to befriend spirits basically allowed one to explain everything about the events. And because those 2 things are usually what explains events so well in other world stories, we expected the same.
Frankly, it's the mixture of the fact that the explanations given fit so well and the fact that this is the norm for these stories that made this quite the plot twist...
And again, the magic boost was something barely introduced...