Some questions about the Air Jordan 1

Hi everyone, i am new in this forum.
I searched the entire internet (kinda) to find some answers, but nothing.
I want to know why some air jordan 1 got the Jumpman logo in the rear, and why some got the nike air instead of the jumpman in the front ?

If you gus have any good link that can help me understand more, i would be very greatful.
Thanks very much

This thread can help you http://niketalk.com/t/508567/official-air-jordan-1-retro-high-thread-vol-best-model-thread