All the males on my place are lavender, so you don\'t have to worry about any of those chicks that hatched out black being pure black and not a \"split\". All the black chicks are \"split\" and carry the lavender gene hidden. If you breed them back to lav you will get 50% lav offspring and more splits.
That crossbeak is a genetic anomoly. It is the second one of the season. I have removed the male that I believe is producing it from my breeding program. If you have any of those pop up in the 2nd generation from any of those other 7 chicks, please let me know.
There are other problems other than crossbeak. Watch out for feather or feather stubble on the shanks and between the toes. Sloppy tails, wingset, sloppy combs, etc all need work. You may have some brown egg genes that cause the otherwise lovely blue egg to be an ugly green color. Oversize, undersize, too much feather fluff, clean faced offspring (lack of muffs/beard), the list goes on.
Males are not hard to come by; good males are. I grew out a whole pen full of them hoping for one nice one. You will be better off to use a very nice pure black of good blue egg genes to cross back over your lavender hens than worrying about a lav male right now. This color needs a lot of work.
Good luck!