anonymous: As I stated in the first post, what is said about R’ Chaim Kanievsky is hearsay and carries no weight in a halachic discussion. Furthemore R’ Chaim Kanievsky does say clearly that if one is sure it is techeilis he is mechuyiv to wear it (see the enclosed link). Also please enlighten me as to how such a statement is not against the Mahril.
As to the Chazan Ish, again that is hearsay, and more importantly he was referring to the cuttlefish.
The Bais Halevi: If you mean the version that was actually written down, i.e. that if it was always known etc. then it is simple why it is not said of the Murex. And if you mean the version that is a Berisker bemesora, being that I am not a Brisker I am not beholden to accept their stories, especially in this case, as A) the Reziner who was corresponding with him quotes it differently, and B) the second version makes no sense whatsoever, since there is no place other than the kashuras of fowel that we need a mesorah.
As to the Rambam, again I refer you to my first post where I stated that the Rezhiner Rebbe says with clarity that there is no such opinion in the Rambam.
[video src="http://techeiles.org/viewer.php?filename=debate%2F%D7%94%D7%A8%D7%91+%D7%97%D7%99%D7%99%D7%9D+%D7%A7%D7%A0%D7%99%D7%91%D7%A1%D7%A7%D7%99%2FHarav+Chaim+Kanievski+www.techeiles.org+.mp4" /]