D
Deleted member 55877
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After eido U' R' U', left index is in perfect position to do F', so I have no idea what you're talking about.I agree with this. In fact, I would rather not have left middle in the back, because it makes my left index have to reach farther to do the F'. I think the difference here is explained by the way each of us hold the cube.
"regripping" (by which i mean adjusting the position of) your index finger is simply faster. And, as I said, index finger F' is faster than thumb F' because index fingers simply move faster than thumbsI believe you guys are both wrong... F' with thumb doesn't require much of a regrip because it is right after U pinch then R'. Your thumb is already on the D layer. On the other hand, you do have to regrip right Index to the top for the stability needed to execute an F' with thumb.