Apparently Nero has a "YOLO" mentality.
There's some neat ideas in this novel, like the backstory behind the devil arms, Berial's "I'm gonna die now so here's my past" flashback showing his connection with Sparda, or Dante branching out Devil May Cry into a franchise by allowing Nero use of the name. Although the part about Nero and Kyrie living in an apartment because the Order collapsed with Kyrie making food for the refugees (and the part about her being a good cook. Wimmenz be good cooks. Grats on that novel concept, BINGO) is incredibly dumb.
But there's a lot of nonsensical light novel-type anime garbage. I don't know if I can really articulate it properly, but stuff like Vergil just showing up in Sanctus' room and giving some coincidental speech that's probably supposed to be what "inspired" Sanctus' later methods, or Vergil showing up in Nero's mind and giving him a "muh power" speech which is what leads to Nero DTing and repeating the "more power" line.
Also Nero beating Dante in terms of power is pure author bias. Hopefully Itsuno's vetoes that kind of shit if they bring Morihashi back for 5.
Was the novel declared non-canon, or was that the DMC1 novel?