Hi Kiai. Rick's right, we are all students here. If you find that someone disagrees with you now and then it is not because they consider themselves an expert...or even smarter than you. It is just that they disagree. Very little, especially in the keris world, is ever written in stone.
As for your Sumatran attribution, i think you might be on to something there, but i still can see this as a Bugis keris. I could be wrong. Afterall, i'm no expert.
I look forward to your knowledgable comments on this and other threads. Would you care to venture a guess at the tangguh of this blade?