We discussed those pictures in this thread
http://www.vikingsword.com/vb/showthread.php?t=2820
I suspect when Hein writes Sun dayak it's the Dusun tribe. And that he mixed up the Dusun with their neigbours the Bajau tribe. At that time most of the Illanun had disappeared because of intermarriage with the Bajau according to Ivor Evans' book mentioned in the thread above.
I find Evans' several years of anthropological field research in Sabah better for separating the tribes than Hein's armchair studies.
On the tiger bell issue I agree with Ben. I find it hard to believe that all the large Kampilan with tiger bells you see now and then are Bagobo?
Michael