Wounding against Leadership

When using a weapon that wounds agains LD instead of toughness e.g. Asdrubael's Obsidian Orbs, do you use the majority or highest LD value in the target unit?

You use the Ld value in place of Toughness, therefore you essentially read the wounding rules, but replacing every instance of Toughness with Leadership. At least, that's how I remember it being.

That's what I thought, but, my friend was arguing that by putting a Wolf Guard in the unit it increases their LD.

I can't see how being shouted at will stop your brain getting fried.

It's not made very clear, but this sounds viable. There is a question in the FAQ, that asks if Ld is used for instant death and the answer was yes, so I think that it's safe to assume, that all wounding mechanics work as normal, you just use the models Ld value, instead of their T value.

P.S.:
Putting an upgrade or independent character into a unit doesn't increase their Leadership, it is just so, that for Leadership tests (this includes morale tests) you always use the highest Ld-value, if there are models with different values.
As a to-wound roll is obviously not a Leadership test, you don't use this rule, but the one used for to-wound rolls, that says, that you always take the majority (or higher, if they are tied), if there are models with different values.

That's pretty much my arguement exactly. Read the rules replacing T with LD. Thanks for the input