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Going back to the original questions, which do not look to be answered, from the standpoint of exhibition, the appearance of the birds, not the genetics, is what counts.
Lavender is a recessive gene, and it is not leaky--if a bird carries one copy (split), you will only know it from breeding records, not from appearance. If you breed splits back to their lavender parent or to each other you will get some who are lavender. However, that does not turn OFF other colours genetically present--blues and splash will still have the characteristics of blue or splash; appearance will be closer to blue or splash than to lavender.
There are dozens of threads about breeding white to non-white; not a good plan--no predictable outcome--every white could be different.
Most of the chicks pictured look to be dark blue, not black; however photos on computers are not necessarily accurate.