Looks like the joints were all tight - is gapping the panels 1/8 inch on all four sides not required with ZIP?
This is a great practice, but a hard won a safety tip here... if the wall is tall or has heavy headers, SCREW the strap to the deck!
20 years ago I was standing up a tall wall with a big header and as we reached about halfway, the wall was top-heavy enough to see-saw over us and actually pulled the nails right out of the floor and it collapsed on top of us. I ended up with a broken hip when I did the 'splits' as the wall smashed me down.
Now I use a couple good structural screws, haven't had a problem since.
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