Mace states something to this effect, sorry I don't have the exact quote, your thoughts? Was this a gradual thing so that the Jedi might not notice. Was it in all aspects of there use of the Force to make them weaker? Or maybe just in the area of foresight? And when the Purge comes about does this blockage to the Force disappear since there is hardly any Jedi left for Palpy to care/worry about, or is this blockage continued because afterall even though Yoda could not defeat Sidious Yoda still is the most powerful left of the Jedi and keeping a proverbial thumb over him might keep him in that weak spot. If this lessened ability to use the Force is still in effect around Luke's time then after Palpy's death could there be an almost rush of Force that Luke had never known because it'd been blocked to him?