That was pretty much my conclusion/tl;dr. The doctors said he didn't have any prior "diagnosed health issues" (which could've existed, just not found) but I'd also be curious of the role ingredients beyond caffeine in the energy drink (even though we don't know which one) may have played.

Even putting the latte, soda and energy drink caffeine levels at the high ends of the range, it still wouldn't be too far outside the 'safe limits.' The news stories definitely seemed to be missing some important information and wanting to focus too much on the caffeine itself.