The statement that the stock always rises the month of the option grant is not exactly true. I guess it does rise, but if you check the beginning and ending prices for the month it does not always end at a higher price.
In fact from the figures on line for the last six years it appears to be a 50/50 ending. Two of those years in which they had an increase for the month were pretty sorry. One was a 5 cent increase and another was a 12 cent increase.