With Salvatore helping to watch over Alvin's corpse, Annan could rest assured and loot the place.
Whether it was Alvin's money, jewels, or other valuable items, he could take them all away.
Of course, the manor itself could still be left for Alvin's grandson. As for the furniture and such, he had no intention of moving it...
He had stayed in the dining room without leaving, solely to prevent the body from disappearing in the blink of an eye.
Annan at least needed to transport it safely into the city, to have the officers of Roth Fort who obeyed the old Alvin come and see for themselves. They had to confirm that their former master was indeed dead.
If the Church of Rot knew that the old Alvin had died, they would definitely try to hijack or steal the corpse.
After all, it was living evidence.
Of course, if after Annan achieved his goal the body was taken away by them, it didn't matter.
——Because the body itself was actually of no particular use to Annan.