I thought the uvb only got them to produce the d3 and they needed the d3 to absorb the calcium? I know they still need the uvb lights.
Gah! I meant to say if you take them outside for sunlight! I found the quote it was a few down from the one you quoted. I'm so sorry!
You want to give them calcium with D3 unless they get regular exposure to direct sunlight. D3 helps them absorb calcium the lights you buy including MVB don't allow them to produce as much D3 as direct sun light. If they get direct sunlight on a regular basis then you can get the calcium w/out D3 for them. I believe that as long as they get a couple of hours of natural sunlight a week you can get away with/out D3 but I have to double check. I have always given all my dragons calcium with D3 even when I let them outside in spring and summer months with no problems...