Why your IAF presented this circumstantial evidence before the confirmation of Pentagon @Osiris and its not logical/solid evidence presented by IAF, our ACM confirmed MKI had been down by our JF-17, Mig-21 has least chance to bring down our F-16, Mig-21 has a design limitations to bring down F-16, no matter how you upgrades your 10 gen Mig-21 @Osiris
Which Pentagon confirmation, Pentagon refused to confirm or deny anything.
It is not solid evidence, that is why it is called circumstantial evidence.
Compare that to evidence, which pakistan has presented, which is absolutely zero, despite several claims, that some evidence will be presented.