So, they changed the point of view of that kids family compared to the WN. In the WN, the parent and the two siblings didn't really see that kid in good light, because to them physical abilities is all that matters (there is no use of intellectual people in there family). There was no mention of a dead Mother, or that the Brothers and Father wanted to take care and protect the weak kid (because they tried to belittle him about his physical weakness in every possible scenario).
@
elsalvadorz: Compared to many other Series, the Mangaka of this series is actually working faster, since most Series nowadays (especially those adapted from a LN) are released on a monthly basis (with breaks of 1-2 months in between).
But here we are getting weekly or bi-weekly releases.