Injury could finish the ride for either of them at any time. It seems to me that Steve is much more self-reliant on a day-to-day basis and Tarzan must be more suscepible than Steve to non-cycling issues. Suppose Jane gets pissed off with life on the road after a few more week/months? Or the van breaks down irreparably? I'm guessing that Tarzan must be a pretty wealthy guy to tackle the ride in the manner that he has, but if he needs a new support vehicle, for example, that's going to take time and, presumably, a fair bit of input from him. The less time he takes getting such stuff right in the first instance, the more it is likely to cost him, in time snd money, later on.