We can never know about pattern and step sequence levels, but their lifts, twizzles and spin are usually strong - no real reason to mark them down there, especially at Nationals. And they can get good PCS, especially for choreography (as you said), performance and also interpretation. I just hope I haven't jinxed then now, and they won't have some unexpected disaster with twizzles or a lift.
Level 1 rhumba for Popova & Mozgov at Warsaw Cup and Finlandia. And her step sequences have always been a question mark. That's my concern technically. If they get the rhumba--even if they are behind in the SD--I would really watch out for them in the FD. If they don't get the rhumba at all, that's a whole bunch of points. (Callers at Warsaw & Finlandia were pretty tough on the pattern. My guess is that P&M can pull at least a level 3 at Nationals).