Oh  -- so Sparrow is basically acting like a UI for the Coldcard at that point, right? Because the Coldcard is obviously not a web browser. 

If my understanding is correct then Sparrow, in that respect, is DISPLAYING the same information from the Coldcard as if the information from the Coldcard was a mobile or laptop with a UI enabling it to interact with the outside world via the internet. 

I thought the steps with Sparrow included the requirement to send all the bitcoin to a NEW & DIFFERENT address within Sparrow first before you sent it Coldcard, making two transactions rather than the one. 

The information displaying from Sparrow, in what you described, is all the same stuff on the Coldcard making it one transaction, it just isn't exposing the key to Sparrow and thus not to the outside world. 

Do I have that right?  

 Yes exactly.