This is OFF topic perhaps but i'll go ahead with it.
I don't know when our Prophet (P.B.U.H) authorized such Imams! Can u shed some light on that please.
Also... according to ur statement, if the so called imams had the final authority... this means that the last available imam can interpret Quran Al Kareem according to his mood, then what about the interpretations of Hazrat Ali (RA)? If he has the final authority then he has the authority to ammend any interpretation according to his thinking stream. Isn't that a bit rude to your first Imam Hazrat Ali (RA)?
i think its been quoted athousand times... Holy Prophet S.A.W said "whoever's i am maula Ali is his maula too." and for your information, imam doesn't interpret the quran according to his own "mood"... he does what is right because he is the rightful successor of the previous imams.. n the interpretations do not go against the interpretations of any of the previous imams... THE MAIN THING IS THE INTERPRETATION OF HOLY QURAN ACCORDING TO THE TIME WE LIVE IN!!!