Yes, edpecially if you were very bloated. You will drop water weight which could be even few pounds

Yes its an aromatize inhibitor, this is what many bodybuilders use precontest to dry out before the diuretics, to dry out means to drop water which will cause a drop bodyweight. When i added adex and proviron to this current cycle i dropped a few pounds after a few days being on it.

From a physiological standpoint, yes. Adex actively blocks the aromatase enzyme by-which its duty cannot be performed, that being producing estrogen. By this inhibiting process the compound can actively reduce estrogen in the body by as much as 80%. Coupled with its estrogen reducing effects Arimidex also greatly increases testosterone in the body and can do so by as much as 50% by increasing total testosterone as well as Luteinizing Hormone (LH) and Follicle Stimulating Hormone (FSH) total output.
As we know, estrogen is connected with water retention. If you're now going to block the estrogen floating around, this could cause a water drop.
So, mainly I would say that the drop in weight you're reporting, is simply water weight and will probably get back as soon as you drop the adex and homeostasis of your natural estro and testosterone is reached.

I know exemestane will as it kills estro...so inhibition of aromatase via adex is possible...when that happens start increasing your calories...