Very interesting thread and debate.....
But, how if the keris revealed came from the Animism and Dynamism period (because the Keris believed has the Tuah or supranatural power) before the Hindu, Budha or Islam period
Then, on the Hindu period, the keris has analyzed an given some symbols as the Ricikans which more real, beauty and has the sense...
So, Hindu, Budha and Islam period just continuing the keris cultures from the past period

.... or, the keris came from Hindu period, but with enthusiasm of Animism and Dynamism soul and pulling out the dogmatic values