He's dealing with potential subject movement where even a stop faster film speed might give him an advantage in 8x10 work, much like wind conditions...
I photograph buildings for my business and for fun with 4x5 Technikardan or digital. Most often I use a 90mm Grandagon or a longer lens for exterior...
On examination, definitely a lot more than several holes that allow light through. So I'll probably be getting a new bellows soon. I'm not sure which...