funny you mention this. i'm doing NROL HYP series right now exactly for the reasons you mention. Two years ago, i did my first marathon and followed NROL to keep my muscle as well as injury prevention. It worked really well as i was able to do a lot of running and stay injury-free. Earlier this Spring, i started training for a marathon and a half-ironman (so added cycling essentially). Within a week, i was injured (IT band issues). Since then i've restarted doing NROL HYP series and after a couple of weeks break, i'm back to running and cycling (often on the same day - so lotsa miles). so far so good *knock wood*. So i think NROL works great for injury prevention. The only thing is to avoid heavy mileage on lower-body days since they are *really* intense.
Good luck!
oh, btw, i've done TNT diet before and it was great for fat loss but for endurance athletes (ie triathlons, marathons) it's really going to affect your performance. i'm on a more carb-heavy diet atm but still adhering to all the clean eating "rules"
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