Doug,
This is confusing to me. If "the address used to send money" is not where the inputs come from, what are you referring to? The address you are sending money to? Or do you have something else in mind?
Sorry. I'm scatterbrained today. I was thinking about coin control and got a couple of ideas mixed up. Yes, money is sent from previous addresses. What I meant to say is that coin control may be necessary to not link certain addresses, not to mention you should always have the change sent to a new address unless you have a reason for recycling addresses.