In fact, we don't know what W6 said in his deposition; after knowing that George had the bloody face and head, in light of what he saw he might be positive now that what he saw was punching.
And an analogy to explain the reasoning behind that:
A witness sees someone fire a gun, and someone a hundred feet away fall to the ground, and says "OMG, he shot him!"
When asked about it later he says "I saw the gun fired and I saw the guy drop...but I didn't see the bullet him him, so I'm not sure...the guy could have just ducked and hit the ground out of fear."
How sure would he be that the shooter shot the guy once he finds out later there was a bullet hole in him?
During the 2nd bond hearing, O'Mara had W6 ready to testify at the hearing in case his written statement was rejected, so the Defense had already talked to him at that point...and after talking to W6, O'Mara was quite confident with using W6's claim that there was MMA style punching. So, I expect that once we hear from W6 again, he'll be pretty confident that he saw George getting punched.