I'm gonna change "Ano..." with "Um..." Also, just so you're aware "..." is a pause in the sentence, not necessarily a new sentence. Under normal circumstances you don't capitalize the letter following one.
If we're talking about fanons, what about Sho's clutziness? What with the stir caused by Byakuren's reveal and sealing, Sho having to hide her true nature as a youkai, the many passing years, and finding herself in Gensokyo, maybe the Pagoda was lost in the burning of a temple or stolen.
As is usually the case, there is a some basis in cannon. At one point in one article or another Aya wonders if Meiling was sleeping on the job, which she denied, and both Inaba Inaba and SSiB feature characters slipping past her while she is on guard duty. In true fanon style, this got blown up and amplified beyond any and all reason.
Clutz Shou is entirely fanon as far as I know though.
...Gasp!!.... Here we have a nighttime lamprey-eel cafe. This evening, those who are tired of bad treatment at work have assembled here again in search of succor...The Weary PeopleThe subordinate who is abused by her superior's klutziness.The subordinate who is scolded by her superior for drowsing off.The subordinate who is judged by her superior for slacking off.Um...don't you think that you deserved your treatment...?EEL