Again it is clear from the gedolei rishonim and acharonim that a mesorah is not necessary – they talk about Techeiles coming back.
Nothing is clear from the rishonim and acharonim. There are many, many factors that are relevant in such a shailah that you have no idea of. You need a rebbe to learn rishonim and acharonim too. Just because they wrote about techeiles being reinstituted does not mean that we nowadays have a basis anymore to do so.