Thank you for your encouragement.
I did play over 10,000 battles since MTW1, through Rome, MTW2, modes etc in last 10 years. I can even play with double speed without pause whole battle and easily win each battle. So, you may trust me that I do not make stupidity with my generals (or princesses)

That's the reason why I choose higher battle difficulty. Because on M battle difficulty it is almost endless morale and fatigue for player. And in all games with your mod I used M campaign difficulty, because I don't know how much scripted stacks you added to evil factions. Aragorn died with G5 5.6, Gandalf died with G5 5.7 (which is actually 5.6 with manual reinforcement-bugfix, I myself gave you hint when arrived manual reinforcement- bugfix and you said "Thanks"

)
In Rome TW on hard battle difficulty +4 attack +4 morale for AI, on very hard +7 attack +7 morale for AI - official CA statement. In MTW2 I just sent request for G5 to check these things thoroughly because no one from CA officially released what is going on with battle diff levels and there are too much contradictory forum reports and subjective opinions and playtests. H battle in Rome is harder than VH in MTW2. You can see that easily if you have installed both games at the same time. There are no att/def bonuses to units on H and VH battle diff levels in MTW2. See my ramblings in G5 thread for more details if you like.
Now, if I increased camp difficulty in TATW (which I didn't), then units have more experience and battles are more challenging and that is another thing. It has nothing to do with battle diff.
Aragorn could quite easily die cause of exhaustion, because fatigue greatly reduce combat effectiveness.
Gandalf death is cosmic joke. Literally! Ah, wait! Maybe he charged so strong when he put in sandwich those heavily wounded peasant archer, that his head finished at the end of spear of my own spearman on the other side of sandwich.