Interesting...I've never seen 5 positions of pentatonics layed out like that... being self-taught, I've never examined my leads to see what exact notes I'm laying over the chords. Of course, I do use the basic (first) minor pentatonic scale quite a bit, mixed with alot of other notes.
As Canuck originally posted, I see how it would be pretty difficult to manifest an "interesting" lead just using one of the 5 scales...pretty boring.