I'm playing out Gib's notion of services for Atharis as the same for individuals lost in battle where their bodies are irretrievable. Atharis was killed by a giggler as was at least one or two of the pilgrims... oh, look! There's one of those pilgrims come back to life as a giggler. Ergo, Gib deduces that there's a real significant chance Atharis' body could come back as a giggler. Ergo, fire.
Not that I really needed to explain any of that but I thought it would help establish the cleric's frame of mind as he turns his friend's body over to the watch.
Now... about the charity Ch'dau would suggest. As a priest, and an ex-military man for the kingdom, Gib will not argue offering what help the party can to the repairs. He'd be fine with all of Atharis' coin going towards that fund.
And believe you me, Davena and her bodyguard have not escaped Gib's mind. Until the immediate threat is resolved, the warrior priest sees no point in spending the mental energy to investigate.
I figure Gib will suggest the party resolve the zombie threat, make sure that the gate is secured while offering whatever assistance the party can to increase security there, help the citizens deal with the corpses in a sanitary and final manner, seek out Atharis' Circle friend, and then look into the disappearance of Davena.
In light of this, Gib will also readily offer up his thoughts on the woman and her bodyguard. They are obviously conjecture, but that's all we have right now.
First, there's a chance that Davena isn't who she claimed to be and actually orchestrated the whole thing. Motive aside, Gib feels he would be remiss if he didn't consider this possibility. Especially with their sudden and opportune absence.
Two, there's also a chance that Davena's man spirited her away to safety somewhere. If this is the case, they will likely turn up, or be discovered in hiding, when a thorough search of the town for any straggling undead is made.
Three, the whole attack was a distraction while someone swept in and kidnapped Davena. She's of some importance if I remember correctly, and this close to Sendria the involvement of a necromancer in a plot isn't entirely impossible.
That the undead would attack the inn specifically would indicate that either the party of adventurers were the target, or one of the other patrons were. Obviously, there's the third possibility... that the inn is just where the majority of people would be gathered at one time and the ghouls could just sense that. But, Gib isn't buying that. His money is on one of the other patrons and to his knowledge, Davena is the only one worth grabbing. Why not the party, you ask? He'll respond that the undead didn't attack the party outside of the city, they attacked the pilgrims. Why when they could have just attacked the party if the group of adventurers was in fact, the targets?
Anyway, some musings.