Most of the cited sources come from the U.S. military, government, or intelligence community. These institutions have a long record of politically expedient deception - from WMD in Iraq, to the Gulf of Tonkin, to the bombing of the Al-Shifa hospital in Gaza - so their claims should not be taken at face value.
The Letters from Abbottabad also fall into this category. Their timing and content are unusually convenient for the U.S. narrative, and there is no independent verification of their authenticity beyond U.S. release.
The Abbottabad Commission’s findings were limited. It was unable to independently verify bin Laden’s residence in Abbottabad except via U.S. assertions. What it did conclude was that Pakistani authorities had no prior knowledge of his presence or of the American raid.
It’s also worth noting that the claim bin Laden was “martyred” by U.S. forces was desirable for Al-Qaeda’s own propaganda purposes. It provided them with a rallying narrative regardless of the underlying facts.
So when you ask whether there is “stronger evidence he wasn’t killed,” the point is that there is no independent evidence either way. What we have are uncorroborated U.S. claims and propaganda statements from Al-Qaeda for whom his death at the hands of the US was a propaganda boon. Neither of which can be treated as reliable proof.
In fact, the level of evidence is comparable to other cases where U.S. authorities presented certainty that later collapsed - such as the claim that the Al-Shifa plant in Sudan produced VX nerve agent, or that Pat Tillman was killed by enemy fire. Both were asserted as fact by the U.S. military and government until contradictory evidence made the truth undeniable. It would be naïve to assume we are working with reliable sources here.