Compared to Malaysia, there are more risks of terrorist attacks in Indonesia. Since ISIS lost their territories in Syria, many fighters including their women and children have returned to Malaysia and Indonesia. The difference is how they were accepted back. In Indonesia, some of them can disappear without a trace. Other countries would have stripped them of their citizenship, so they become stateless and no country wants to take them.
They reported that they are looking for the Iman they believe radicalized him. Can't find. The say it doesn't look like he was part of any group. His wife, him, and an Imam would be a start for a group it sounds to me, Especially since his wife was radicalized before him and seems to have a GROUP. Good they got her.