There's a lot of speculation as to what happened. Best I can put together is that he was hiking the PCT going south from near Anza on Hwy 74. This would be about a mile ESE from the Paradise Cafe at PCT mile 152 if I'm understanding things right. His gear was found near the PCT south of there at about mile 127 which is consistent with the preceding. His gear:

Apparently his wallet and ID were with the gear. Now why would a south bound PCT hiker walk away from his gear? Maybe to take photos, get water, or take a potty break. In other words, he should be fairly close by his gear, but he has not been found. Some have speculated that a cat got him when he walked away from camp for a moment and then dragged him into the brush. Who knows, but he's been missing for a couple of weeks now. Doesn't look good.
HJ