“Reading onward in the kesef mishna only shows that ???? is not included in ??? ????. Which makes sense because ???? can basically mean any dark color whereas ??? ???? is exactly like Techeiles”
the question you quoted from the kesef mishna is
??? ????? ?? ????? ???? ??? ?? ?????, ?????? ?? ???? ??? ??? ???? ???? ???? ??? ???? ???? ????? ??? ??? ??????
so his question is based on hanacha that shachar in the rambam is included in kla ilan and he has it shver because it shouldn’t be. So the only hechrech kla ilan is kolel more than one min is based on the lashon shachor
The teirutz I quoted says
?”? ????? ??? ????? ????? ????? ??? ???? ?? ??? ???? ???? ??? ???? ?????? ????? ??? ?? ??? ??? ??? ???? ???? ???? ????? ?????? ???? ?????? ??? ???? ??”? ???? ????
meaning that shachar is NOT nichlal in kla ilan, meaning there is no makor that kla ilan is more than one min. vdoi”k
about the gemara in menachos, there is definitely a chemical difference and Levush Haaron and others say the gemaras test was indeed done and it differentiated, and there is pictures backing this up. But forgetting about the Murex, the lashon hagmara is surely mashma that not everything that color is nichlal, because what was the raya when it got darker, maybe he discovered a new type of kla ilan
my point with the shiltei hagiborim is that he writes bfeirush techeiles is blue and writes elsewhere it is from murex. Meaning the shiltei giborim knew murex made blue, so who said rishonim didn”t know?