If Zimmerman needs to come up with full collateral for the bondsman, he can do the same for the court, in which case he only needs the 10%, which he has. ergo no bondsman needed, he gets the 100K back when he shows, and can then pay his lawyer.
The bond is a million dollars not $100,000. Where does he find a million dollars worth of anything. For the first bailbond of $150,000 his parents posted their house and he came up with $15,000 in cash for the bail part.