You always said it is impossible for a machlokes in metzious between the different people who saw techeiles. So if Historians say so, and that is also the pashtus of bavli, we must be docheh yerushalmi. But once you agree there can be machlokes, than we have no reason to be madcheh the pashtus of the bavli to agree with yerushalmi.
from rabeinu yone is no raya, since the mordechai learns like rashi and elsewhere writes meforush that it is blue. and anyways green is domeh to blue lfi the yerushalmi that says yam doeh lasavim
the mishna achrona clearly understood the Ras”h on the color of techeiles therefore the mishna achrona brought the Ibn ezra. the chazon nochum disagrees with pshat in ras”h. The rash himself doesn’t bring the ibn ezra. the cahzon nochum is obviously not the pashut pshat, but obviously it was very clear to him that techeiles was blue so he had to be madcheh.
there is more to be maarich, did you see the new kuntris with the article from reb binyamin horowitz?