The topography doesn't allow a trail from fitz to creekside. Top of fitz is equivalent to top of insomnia and earth circus, plus/minus 50m or so. Furthermore, by the time you get to the Olympic rings, the taluswood property line is right there. To top it all off, there's a bunch of cliffs to get through on the way. It would be a very up and down trail and would have to include some significant uphill climbs. Try riding the north west passage end to end one day when you're bored.
The trail above kadenwood is a continuation of South park. Basically an access trail for future development. There is no a-line style jump trail going in anywhere at this time. Feel free to email suggestions to wb. There is however a short blue jump line that went in off the lower reaches of current south park that will dump you out on elixir.