Yeah couple of options here:

• he's the guy but is irrational, mentally whatever and not the calculated genius the online hype has built him up to be
• he's the guy and intentionally got himself caught / planned to give himself up for a variety of possible reasons (acting as a public figure, mental instability, guilt, sense of righteousness/justice idk)
• he's not the guy and the information on the gun and ID is false or misrepresented
• he's not the guy but a whole slew of planted evidence, fake/exaggerated reporting etc make him out to be the guy, which imo seems like the most conspiracy-nutty take. not saying it's not possible but it seems the least likely.