Dependency based properties

I have following questions about dependency based properties.

1. Suppose we have formed following drpendency:

A <- B (B depends on A)
A <- C
B <- D

If A and B cannot make a progress, do C and D have the same precedence?

2. Another dependency setup:

A <- B
A <- C
B <- D
C <- E

If we make B depend on X,  only B and C are moved to under X and drpendency
now looks like this:

A <- C
C <- E
X <- B
B <- D

Is this correct?

3. Same initial dependency setup with 2.

If we move B to Y with exclusive flag set and we have Y <- Z dependency,
the final result look like this:

Y <- B
B <- D
B <- Z

Is this correct?

Best regards,
Tatsuhiro Tsujikawa