a good 'Zorro' seems o be a real challenge!!
I´ve sown several " 'Zorro' " seeds from Mesa Garden, Ozlithops and Francois Hoes, but still I can´t say, there is a real 'Zorro' whithin.
Surprisingly L. dorotheae changes their pattern even when they are grown up! One year they have sharp, long red lines and almost no windows, the other year not!
I think, the only way to get some is to sow plenty (>>100) of seeds and select.
In my opinion, 'Zorro' is more an idea than a stable cultivar.
Herzliche Grüße aus Berlin