You can find "dubious histories" on users from many countries. It's just that one local board makes it easier to link them. If naim027 is still active here with an alt farm, my guess is he must have several accounts that never posted in the Bengali thread.
Seems totally logical. If I knew, I would die from diabetes, I would start taking insulin way before I am diagnosed with diabetes. As a precaution. He would have avoided the local thread. It would make the search more wider.
What worries me is the fact that JG thinks, every users from a specific community is operated by naim027 or an alt of his. If you were truly a local member from Bangla community, you'll notice big difference in posting pattern (in local language). And only a local member can identify that. We have different tone, different words, different ways of speaking which varies from region to region.