I don't think you read my post. Robert isn't the best, he's just the most all-purpose of my high tier.
You're using the graph wrong, then. Top right of each quadrant is "best" of that quadrant. So, top right of quadrant one means, top tier & all purpose.
Think of the top right of the graph as an extreme, top right is the best position, the closer you are to it, the better, even if you're in quadrant 2. So, top right of quadrant two is the best of quadrant two.
Now, bottom left is what you don't want to be close to, that is the worst of the worst, even though IMO nobody is the "worst". Bottom left means has weakness and low tier.
I've seen a lot of people using the graph incorrectly...it doesn't matter if you get your point across, but that's not the case here.
I guess I can toss out a top five while I'm here, I don't endorse tier lists, it confuses the hell out of new players and gives them a false feeling of understanding. Just for kicks though, my personal top five is (in no particular order).
K'
Kyo
Claw Iori
Kula
Benimaru