The defense never relied on tiny features in pictures that they enlarged, did they? And if they did, that might be invalid, but did the prosecution object?
Even in the blown up image, I can't make out anything meaningful. Is that a gun, or is it part of the background or even some visual artifact due to the very uneven lighting and video compression? If it is Kyle's AR, how does the drone footage tell us whether the gun is laterally aligned with the Ziminskis? And why, if it was a legitimate threat, did JZ not shoot Kyle? He had his (now "lost") handgun in his hand half the night.
When images are enlarged using interpolation, whether it's nearest neighbor or (bi)linear or (bi)cubic or adding pixels using a neural net, that at best creates distortion and false impressions of where borders of small (in the original image) features are located (w/ nearest neighbor). More typically, with linear or cubic interpolation, it would give the impression of a gradient that doesn't necessarily exist in the real scene. AI interpolation can completely manufacture fine details. In my opinion, none of those should be accepted in a trial if fine details in an image are important. The jury should have access to pixel-exact version of the video or photo, and should still be cautioned about the limitations of lenses and compressed digital video.
Courts need to get this right. They need to understand source and display pixel aspect ratios and resolutions, frame rate, interpolating pixels during zooming, interpolating frames to increase the frame rate, pixel encodings (like YUV 4:4:4, 4:2:2, 4:2:0, etc). To fail to do so when tiny details are important to the case, leaving interpretation of a few pixels up to a jury of average people, should be a constitutional violation because it's not a fair and accurate manipulation of the original video.
That's on top of other problems with taking meaning from small-scale details in photographs or video frames, like lens-related artifacts due to lighting, smoothing, sharpening, and other things done automatically by chips that take signals from the image sensor and encode that into the video the camera ends up storing. I don't know what kind of drone that was or what kind of camera it had, but I doubt the footage was recorded in uncompressed raw video. The prosecution doesn't need an "expert" to tell them this. For the video encoding issues they could ask anyone who's used with ffmpeg a lot. like a pirate anime releaser. For the lens and digital camera issues they could ask any serious amateur digital photographer.
If the prosecution wants this evidence in the record so badly, why didn't they call one of the Ziminskis to the stand, have them tell the jury whatever they want in exchange for immunity for assault on Kyle and any directly related charges, and let the jury judge credibility? Evidently either the Ziminskis, if they were asked, weren't willing to testify that Kyle pointed a gun at them, or their credibility is so weak it would've been pointless to put either of them on the stand. Given how terrible the prosecution's other witnesses were, I would speculate that the prosecution didn't even try to get the Ziminskis to testify against Kyle. Kelly Z accepted a plea deal with some jail time for her other activities that night. It makes no sense that she would refuse a better deal in exchange for her testimony.
Maybe Kyle pointed a gun at them. I don't know. I wasn't there. I'm not omniscient. How does any of this reach even 51% confidence, much less beyond reasonable doubt, that Kyle provoked anyone by committing aggravated assault? Even if he did, how does the obvious, prolonged retreat not restore his self defense privilege?
I'd love to get a copy of the actual original video, and go frame by frame through that moment. That might convince me that it is a gun and that Kyle raised it, but wouldn't tell me whether it was pointed at the Ziminskis. Life isn't 2-D. There are times when someone carrying a rifle ends up moving or adjusting their arms in a way that brings the barrel closer to horizontal. The one good thing about that ex-marine, Lackowski, is that he was very careful about aiming his rifle down most of the night, to such an extreme that I was worried for his feet. Not everyone is that attentive to muzzle discipline. Even Balch was less careful, and might have covered other people's feet or legs at times throughout the night. Arguing that Kyle assaulted Ziminski because his muzzle might have gotten uncomfortably close to pointing at JZ should require good quality evidence, or testimony, that the muzzle covered him at some point.