Actually you're all wrong. You can't use JBII on margin to buy something else, but you can buy JBII on margin.
If for example I'm all in a Dow stock, I can still buy JBII on margin. If I'm all in JBII, I can't buy a Dow stock on margin.
In other words, margin = collateral. You can buy JBII on margin, but you can't use JBII or any OTC as margin to buy something else.