As the saga for finding out why N. inermis from malesiana has that purple tinge, i have some very interesting information and i am grateful to personal communication of a personal communications from Chi'en who was keen to provide:
He told me that both N. inermis and N. bongso grow on G. Talang and this is the mountain where the alledged MT's seed originated from. They also grow together on G. Gadut,and he has visited this mountain with Charles so he knows he can verify this fact. In most places it seems that N. inermis grows at a slightly higher elevation than N. bongso, but it is of course still possible for hybrids to occur.
The purplish hybrids are pretty much a sure fire-bet N. inermis x bongso, according to him, since the only other hybrid parents could be N. pectinata or N. talangensis which it doesn't seem to have the characteristics of.
These are the images of the alledged hybrid
If anybody has any more questions, please PM.