If you look at the rules or guidelines for "Draw Two Panels," you'll see that it's possible to deal the panels into slots #2 and #3, instead of having them separated by a single panel.
My idea for the legal arrangements is this: the strip will go into more interesting territory if the newly-drawn panels don't merely happen in between the panels that come from the deck, but they will be more constrained by the deck panels if you get no more than one new panel in a row.
If no more than one new panel can appear
Of course, these are only my principles or guidelines. If you're playing "Draw Two Panels" yourself, you can make your own decisions about your constraints.