If your saying that if you swapped the floating tie,I wouldnt think it would change the rotation,never heard that asked before,and it is a good question.The incoming phases on the primary side would be the same,and the secondary would remain the same,it would change the polarity,but Id vote no,as far as changing the rotation...now if I was an apprentice again,that is one question I would ask of the supervisors/foreman when at the end of a verbal test,they asked me if I had any questions....did that once when I asked them about what leads what on a capacitor bank.....the reactance or the resistance.I used to know,but i seemed to have even forgotten that one.