LOL...I believe you have a point there.
I also wanted to add to this perspective to the "don't you think that after being alone on an asshole of the universe planet for 20 years by yourself" reasoning. This would make more sense towards a person with a normal, human lifespan, but keep in mind that Yoda is 800 years old. Is 20 years of self imposed seclusion really enough to change an eight-century-old speech pattern?
Not that this proves anything one way or another - this thought had just occured to me.