Looking at the shoe and how the omn1s is made the back of the sig shoe is significantly straighter up and down than the omn1s. As you can see the omnis has a back that hangs out and curves significantly like one of their newer running shoes like the 1080v10, also the sig shoe has a bootie inside it as you can see in this pic. the fingerprint/brain pattern is a bootie with the top of the tongue stitched on and it loops down and into that back piece that goes over the back of the shoe. i grabbed a pic of the all white ones he wore long ago and put black lines where the booty in the shoe seems to go as you can see there is an open gap under that ankle piece that isnt seen as clearly on some colorways.