What Obi-Wan's Ghost Should Have Done

"If you strike me down I shall become more powerful than you can possibly imagine..."

What, like turning into a blue wispy ghost that offers condescending shreds of advice? 

Thirty eight years on, the debate still rages as to what Obi-Wan really meant in his final duel with Darth Vader. Really, you can find whole forums dedicated to it. No we're not contributors. Any more. 

Ominous threats aside, Dorkly believes that Obi-Wan missed a prime opportunity to thwart the Empire as an unstoppable spook. At the very least, he could have haunted Vader rather than pestering Luke with sage wisdom. 

Here's how things should have played out...

And yes, you're right - it's a joke Robot Chicken came up with a few years ago. But it's still a pertinent point - why aren't Force ghosts more useful?