If "sir" as he was then known during 'Fall Out,' was to face his inauguration, then the transfer of ultimate power to him would surely follow. What would then physically happen to No.1? Perhaps he would cease to exist, or perhaps somehow they change places? If No.6 and No.1 are one and the same, as McGoohan has it, and it is No.6's evil side who was No.1 at the time of his abduction to the Village, then would not "sir's" inauguration and the transfer of ultimate power to him, not bode well for the citizens of the Village? Because surely it would then be No.1's other self , his good side who would be No.1. The others Hyde to his Jekyll. Either way, physically things would remain the same!
So why look to replace No.1? Perhaps they thought that if they could persuade the former No.6 to lead them, he might find a better way for the Village.
Be seeing you