ahh, Cheetah. Everyone's favorite up-himself, condescending-to-others poster.
No-one's gna win this one. I'll say I haven't specifically done research for you. You'll say I have. We'll go round in circles. I haven't, but if you think I have, good for you.
Actually, you fail because I initially linked a vid of Wawrinka hitting an open stance backhand and you said he was hitting off his front foot. You failed to slow the video down frame-by-frame to see that he hit off his back foot, then landed on his front foot for recovery.
I then showed you two more even more explicit examples of Kuerten hitting backhands off the back foot in an open stance, and for some reason you're claiming I'm failing.
Whatever man - just go back to apparently breaking kevlar strings with every forehand you hit, and bending the ball into egg, disk and origami shapes (depending on the spin you wish to impart) because you're so uber powerful and omnipotent. Oh, and make sure to tell any noobs that they can't play tennis unless they can do all these things.