real simple answer here
a BUCK will make a scrape any where it wants to, no ryme or reason needed
they can and do make scrapes all yr too, NOT just in the fall too!
However, they make the most , in the fall !

also, a scarpe can be used by many bucks,a nd NOT just the one that made it
bucks from other area's traveling thru will use one already made, or make one near it or???
NO real science on where a buck will make one

field edges are big spots, but most of these are made at night
near bedding area's logging roads, are prime spots, as with staging area's behind food source's