that the fist hit the inner thigh and slid up it slightly before Lapuaho pulled his fist back toward his chest.

If you want a screenshot, etc., I'll have to find somebody who recorded SportsCenter that night. There were at least four shown on the episodes of SportsCenter I watched (or rather, on the same episode of SportsCenter that was repeated a number of times). The clip with the best vantage point was one of those. Moving clockwise as viewed from above, one clip was from behind Chanceller James, next was the one that everybody is posting (the one you linked to), the next from an angle a little bit farther along that arc (giving the best combination of angle and lack of obstruction, and finally one more from an angle rotated around so that the view was mostly obstructed.

The first and last clips don't provide any helpful views, so essentially it's all on the second and third views. The second clip gives two important clues. First, it's apparent that Lapuaho's fist first hits James a little ways down the inner part of his upper thigh. It then slides maybe 2 inches or so up James' inner thigh, then moves at a slightly upward angle toward Lapuaho's chest. One of the key points here is that after the initial impact, Lapuaho's fist does not stop moving, or even appear to go over a bump, etc. It essentially continues the slide without obstruction until it goes to Lapuaho's chest. If it had made contact with James' central groin area, Lapuaho's fist would have met resistance, and at the very least would have broken it's smooth path of movement. The complete path from the initial contact on the inner thigh, through the slide up the leg, then to Lapuaho's chest
had no stutters, but was smooth. Why? Because it first slid up James' inner thigh then smoothly changed its angle as it went to Lapuaho's chest.

In addition, in that clip, the fist is moving away from the viewer, so the change of depth (the distance from the viewer's eyes) is also a clear indicator that the fist first made contact with the thigh at a distance that at was least sufficient to the fist to slide up the thigh then angle up and away toward the chest without really even breaking its stride.

Then the third video, which ESPN apparently decided not to post, shows an angle that clearly reveals space between Lapuaho's fist and James' central groin, both when the initial contact is made, and when the fist angles up and away toward Lapuaho's chest. Either of those should be more than sufficient to establish the fact that the contact was with James' thigh, but together they demonstrate rather conclusively that the punch was to James' thigh.

If I can find some type of graphic from SportsCenter, I'll post it.