Dave,
lets look at it a little logically...shall we :-) After designing the Guarneri Homage, Franco went on to design the Cremona lineup, the old Amati Homage, the new Amati Anniversario, the new Strad. and finally the new Guarneri Memento.
Are you saying that Franco did not learn anything new in the time period that he was designing all these great speakers ? I don't think you will get too many people claiming that the older Amatis are better than the newer Anniversarios.
Why then would you think that the Mementos would be inferior to the Homages ?