Well, I don't know about keeping boars, but I have four sows (kept in two pairs), and from time to time one of each pair rumblestrutts and purrs around her friend. It's all perfectly normal, and nothing to worry about.
From the things you have said, and the pictures you've posted, your two piggies look very happy and contented with each other.
A number of years ago we brought home two young sows to live with an older one, and although they all got on fine right from the beginning, I suppose I would say it took about a week for them all to be settled down, and for the older, dominant one to have got used to them being there. Perhaps after Ted has been with Wiggy for a few more days, there may be less rumblestrutting, but don't expect it to cease totally. Hope this is some help!