Mercy death theory

Ive just watched the Lightcallers vid "Echoes of Ambition" (https://youtu.be/PwAm-gUPBkk?si=woFdCuT0rfPGMYLR) and something stood out for me that led me to belive it was Mercy who got shattered, let me know if my theory has any merit. It builds on a few points he pointed and might have not explored enough in the vid. Firstly it is known that Ambition never invested a planet yet the but the perpendicularity on Therenity, which is most likely Mercy's, has turned into the Nul and is infested with entities. Why would that happen to mercie's perpendicularity? Another point is the entities behavior, in Isles of the Emberdark the entities has a sadistic impulse to mentally torture their victims, in the vid it is explained as the combanation of Ambtion and odium's investature. On the other hand my thory is that they are actually made of mercy's, it was also noted that they are made of antiinvestature so wouldnt that flip the intent of the entities? from mercy to crulty which mach better then then malice which was sugested in the vid and also address the nature of antiinvestature. lastly trough the whole cosmere there was no interaction with mercy so the only witness to the shattering of ambition is odium which is not the most reliable source and might have wanted to hide it for some reason. important to note that it does not contredict the shattering of ambition, it might be in addition or insted. let me know if i missed any info or it actually possible:)