2 cabbage butterflies inside a tulled zucchini bed!!! Must have hatched from kale leaf used as mulch?

I highly doubt they would have been motivated to crawl underneath the tulle given it was just zucchinis inside.  So, I'm guessing they were eggs/caterpillars on kale leaves when I used some to mulch a while back, then emerged this morning as these two butterflies.  It's the two zukes in the west bed, southmost part -- which is right next to the broccoli bed, so maybe they wormed their way in that way instead...