Not seeing your logic here. I did process the Leaf files through LC11 and didn't see any difference from what I got from ACR other than the LC11 conversions were flat.
When I downloaded the Aptus 22 ISO 200 raw file, it downloaded as a tiff. I changed the suffix to .mos and then brought that file into LC11. I processed out and compared to the tiff ZD file and the .mef ZD file (which also downloaded as tiff, but I then changed it to .mef).
Here were my findings:
I viewed the ISO 200 ZD files in Photoshop - both the Tif and (ACR-converted) .mef.
I also viewed the Aptus 22 tiff file and the converted .mos (via Camera Raw) in Photoshop.
I also converted the ISO 200 .mos file through LC11.0.1 and brought it into Photoshop.
My results - the Aptus tiff and the ACR conversion both looked slightly noisy with a fair amount of color noise.
Ditto the ZD files, although the ACR conversion, while still a bit noisy, didn't exhibit much color noise at all.
The LC11 converted .mos file, opened up in Photoshop, was way
cleaner than any of the other files. There was no comparison.
Something doesn't seem right with your results from the LC11 processed tiff.