HOLY SH*T, URAHARA JUST WENT BANKAI! THIS IS GOING TO BE AWESOME! ASKIN IS SCREWED!
Ah, just kidding. Askin pulls out a Bankai stealing Medallion, and steals Urahara's Bankai. Why can he do this, when no other sternritter can do it after the Urahara turned everyone into Honorary Vizards? The answer is, of course, Because he is Askin Nakk Le Vaar, and can do whatever the hell he wants.
Also because he can give himself a resistance to Hollow Reiatsu, Nullifying Urahara's method of countering the Bankai theft, and preventing soul suicide if he keeps the Bankai.
Ah, just kidding. Askin pulls out a Bankai stealing Medallion, and steals Urahara's Bankai. Why can he do this, when no other sternritter can do it after the Urahara turned everyone into Honorary Vizards? The answer is, of course, Because he is Askin Nakk Le Vaar, and can do whatever the hell he wants.
Also because he can give himself a resistance to Hollow Reiatsu, Nullifying Urahara's method of countering the Bankai theft, and preventing soul suicide if he keeps the Bankai.