When I look at the Hierarchical view of the default trust network, I see that he is roughly in the middle of his trust list, that appears to otherwise be in roughly the order that people were added in.
That list is ordered by user ID, not added time.
I think the main problem is that the trust system has given members that haven't proven themselves responsible enough the ability to mark someone's account with negative trust, and essentially ruin the account.
Any inaccuracies will eventually be fixed. I'm not going to allow the default trust network to contain inaccurate ratings for long.