dont know much about the specifics but sometimes certain MM don't trade with one another; i.e. see the bid and the ask at the same price but trades are going off either one bid lower than the highest bid or one bid higher than the lowest ask. If your LII screen is like mine, the pro's are listed in all CAPS i.e. PUNK, THINK and the retail houses are all lower cases, cinn, etc. and sometimes they don't even see each other. That's why sometimes you'll see two huge lots at b=a and they won't cross or cancel.
Solution is you find a way to counter the autoroute and individually target the house that's got the ask you want to snag, or call the desk at etrade and tell them your situation and their trader will make it happen.
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