Without rushing to urge the weary soldiers into action, perhaps Gu Mo lacks the capitalist spirit and awareness, and doesn't feel they are working for him.
So, he thoughtfully let the soldiers have a good rest until the afternoon, before having them, refreshed, engage in clearing the entire mansion... After all, many hands make light work, much better than the three of them searching aimlessly.
--- It wasn't even the three of them, actually it's just him who is consciously concerned with this issue, yet it's difficult to explain to the other two.
As for Fujikichiro, he naturally didn't know; while Hidechika, despite sensing some Demon Qi still lingering in the mountain's belly, was unaware of a secret passage leading inside the mountain hidden somewhere deep in his father's mansion and didn't think much of it... So only Gu Mo himself was certain about this matter, but couldn't explain it to them.
