Please help confirm breeds of my chickens :)

[Treeoflife]

Welbars I think:

Black cuckoo maran I think:

And this one I am supposed to be picking up tomorrow, is she a Lavender Australorp??:

 

[JedJackson]

The first three pics probably are Welbars, but they are difficult to distinguish from Bielefelders, so could be that breed as well.

I think you are right on the cuckoo Marans.

The last is more likely to be a lavender Orpington than an Australorp.

 

[SchwartzLakeFarmNC]

I would agree with your conclusions, the 1st three are not Bielefelders though, Welbars seems correct. Our Biels are much lighter in coloration, none are as dark as yours.
Last one is a Lavender Orp.
Wonderful flock though!