Yes, I think it was a requirement that both ends of a wire were at the same level on the pin. So you might have an additional top-level wire but you wouldn't end up with a long dependency chain.

I should also mention that the original (non-field) wire wrapping was done with an automated machine, the Gardner-Denver Automatic Wire-Wrap Machine. It had X-Y carriages with wire-wrap tools and it wire-wrapped the backplane according to a deck of punch cards. Details: http://www.bitsavers.org/pdf/gardnerDenver/SM506753_Paramete...