well i know when doing barrows every now and then while in the tunnel if your lucky you'll get brother that will attack again. even though you have already killed him in his crypt. so got me thinking... if someone were to just stay down there and keep opening and closing the same door would you after a while get a brother and then be able to get a high kill on them, which it is now confirmed that only the bros effect barrows items. so if i got 15 kc on just the bro's would that mean i'm very likely to barrows item? just a thought i hoped someone might know the answer to.

I very much doubt that - i think it still only counts you as having killed the brother once, even though you're kill o[bleep] goes up. Plus in the amount of time it would take you to get the same brother 15 times, you could have probably just done 15 more runs and increased your chances that way.

You cannot get a brother to spawn in the tunnels if you have already killed him in his crypt.

 

A similar thing is to open the doors repeatedly and spwan twin brothers. Max number of bros you can spawn is 3 on each side of the door. So you could get 36 KC on just brothers. But the brothers can multi attack you, if you have more than one type of attack styles (like 3 karils and 3 dharoks) in the room it's gonna be a tough fight :P .

 

I sent in a query about the twin brothers giving more runes/item. Their answer was vague but what I understood from is that the more bros you kill the higher your chances of getting an item.