I've previously tried cycling high carb training days and high fat rest days (leangains style), as you have suggested. I found it a lot easier (both physically and physiologically) to restrict carbs and lose body fat.
Based on the catalyst episode Shane Watson (including many other athletes) has experienced similar results so it's something people looking to reduce body fat while remaining highly active should consider.
If people are highly active why are they having to restrict calories so low to lose fat. Something isn't right there.
Why the need to do high carb and then high fat days. Why not just stick with a happy medium.