Sorry to hear about the rat. Similar thing happened to me a few years back. I was actually pleased that the poor rat found somewhere snug and sheltered to die. But not nice to find. Just as well you decided to clear out the hogilo!
Re. the hogs not coming. Quite often at this time of year there are mostly male hogs around. Males have larger ranges than females, so once they have come and fed up on the food you offered, they may have gone exploring other parts of their ranges. I am finding that some of the male hogs here will miss several nights and then might come back. So you might find they reappear. Fingers crossed.