Hi Miabella
Although I can not comment directly on your post since we are not exactly there yet (understatement of the year) I know that some handlers train across all 3 levels at the same time (or some variation on the theme). My trainer has us working on open exercises while we finish proofing and polishing Novice...
The only thing I have noticed is that over time is that Bella and I understand each other better which makes training new exercises a bit easier (I should say SOME exercises)....
Ok did I get totally off topic with this
LOL