A nice little episode with some Goushi focus. While I really like this one, it admittedly doesn't manage to develop Goushi a lot. However it does highlight how he doesn't let emotions get in the way, i.e. when he destroys the statue. This is in parallel to one of the kids of the week who also doesn't let the emotion get to him when he understands what's going on. Anyway, makes you wonder how much more they could have done if they had the extra 5 minutes sentai shows nowadays have.
That aside, let's focus on the mythological aspect of this week. The statue of the fairy represents the tree which is the soul of the forest. And that statue attracts insects, just like the tree does, and in this case butterflies.
Ψυχή (Psyche) is the classical greek word for soul but also for butterfly. So it makes sense that it's butterflies that are shown to be drawn to the statue.
"Psyche, then, is the human soul, which is purified by sufferings and misfortunes, and is thus prepared for the enjoyment of true and pure happiness. (From Bulfinch's Mythology: The Age of Fable, chapter XI)"
So as a butterfly comes out of it cocoon, so did the Dora Monster come out of the statue in this case.
Now you may be thinking, if psyche = soul or butterfly, why are butterflies the cause of harm to the children in this case?
Well, one, a butterfly represents death (and also rebirth after death), two, Thanatos used to be portrayed as a youngster with an inversed torch in one hand and a wreath or butterfly in the other, and three (and most recent), during the 1600s in Ireland killing a white butterfly was prohibited as it was considered to be the soul of a deceased child. There are also links in Greek mythology of butterflies symbolising a soul - perhaps explains the two meanings of the single word.