Here is the ephemeris wheel for that pattern. The Grand Cross sets up the 4th harmonic.
Chaos comes when there are harmonics in a binary ratio.
So it is important to look at the wheel for any planets dividing the sides of the Grand Cross into two parts. Venus at B does just that. That sets up the eighth harmonic. Then one needs to look for planets at the 16th harmonic. These would be at 22.5 degrees to a corner of the Grand Cross.