Yes, you will still have to cycle the marine pure- you're simply building up a large enough bacteria colony to process ammonia.
In theory, assuming you didn't feed the coral, there's a good chance you could get away with putting the coral in a sterile container and the surface area of the rock/frag would likely cover any waste products (how most people are able to get by without rock at confrences/frag swaps). However, since there's a chance you may introduce a fish or decide to feed your coral, it's probably best to cycle your marine pure so you have flexibility later on and avoid any ammonia spikes.
I would simply put the marine pure in your DT for a week or two, then move it and your new coral over. You should likely be good as long as you don't overfeed your frag tank at first.