As mentioned, from the proto keris, forms branch off depending on the timeline and region, so it would be interesting to see a family tree with the various keris and kris to get a clearer understanding when symbols and types took place. In regards to the Moro kris, evidence from artifacts and written materials reveal ties to Indian culture and parallel interconnection to Indonesian kingdoms. Its also important to take in account cultural relationships to China throughout Moro history. In the early 15th century Sulu "kings" were recognized by Chinese royals when an entourage paid a visit to the mainland. Of interest, there is a village in China that trace their heritage to the early kings, one of the kings died on the voyage, some of the relatives stayed behind and the following generations to this day still take care of the tomb of their ancestor. The conversion to Islam in Mindanao and Sulu as well as the parts of the Visayas and Luzon began in the mid 15th and 16th centuries. From the early proto keris two distinct forms develop into what we call here the kris and the barung swords in the Moro regions.
http://www.geocities.com/sinupan/batara.htm
http://www.china-sd.net/eng/sdtravel/scenery/26.asp
http://www.bangsamoro.info/uploads/photos/26.jpg