Chrome,

No mate, you sprooking assumptions based on what you 'feel' is logical. One thing I have learned in this game is that racing 'logic' [most punters follow it] often leads to the poor house.

Someone puts a big bet on and all the wallies [those following the 'smart' money :-) ] jump on board taking whacking big unders and we all know that taking unders leads to the Salvo's ...... Shortener's = [inevitably] Underlays!

The golden rule is : VALUE and most shortener's by their very nature, don't fit that bill.

Opening prices and final prices would be required to prove anything about drifters and firmers.