In example 1, note that the red and blue arcs are pretty close together even though the lengths of the components are considerably different. You will have a small amount of bump steer within this range of vertical movement but it should be acceptable.

In the second example, the pivot points are in widely different horizontal planes and though they are closer to the same length, as you can see, the arcs in relation to each other change dramatically as the components move up and down. Since neither component can change length the result is that the spindle has to revolve to allow for this conflict. This would give a severe case of bump steer.

The third example shows a 4 bar arrangement with the drag link being parallel and equal length. If you look at the black lines and the dotted black lines, you will see that they maintain a equal relationship as they move through the travel. The bottom line to this is that it is best with hairpin radius rods to keep the attachment point for the drag link as close to the same center as the radius rod attachment point. If it can't be achieved, keep it as close to the same height from horizontal as possible to minimize bump steer.