Sounds ominous to me, it may be that something foul has happened to him and isn't able to be contacted or in a place to respond.
I would certainly give him the benefit of the doubt.
I've 'talked' email wise with him a long time ago and never got the feeling that he was not on the up and up, seemed to be a man of his word, so if someone can do a door visit, maybe we'll find out what has happened to him and clear this mystery.
G2
edited to add, did a quick check on a couple forums and looks like the last time he posted to any threads was near the end of November beginning of December...