Superfluous marshal abilities?

[Syt]

I like the RPG building of strong marshals. However, there's a few traits I can give them which look very similar:
- Leadership gives a moral bonus.
- Conqueror(?) gives the same moral bonus, but only limited to enemy countries.
- Zealot is the same again, but this time it counts against other religions.
Why should I choose Conqueror or Zealot if I get the same bonus, not limited to certain cases with Leadership, anyways?

Or am I missing something here?

[Shimo]

it would make sense if there was no "cap" on morale, so units could have like 20 morale if you had all those three plus glorious victory and a king with three war stars. that way they would never run low on morale no matter what the odds or circumstances. i'm not sure if it's this way or not.

[Syt]

Stacked bonuses, yes, why didn't I think of that?