Wow! That's really fascinating!!
Nice! Thank you for sharing the link! Never heard of blue eyes.Splash looks lavender at times in chicks. And black birds can be hiding other feather patterns even though you don't have any white birds in your flock... If you splash bred to a blue.. this is likely another splash offspring??
All juvenile birds have light colored, greyish.. maybe blue ish eyes, I think.. and suspect it will change significantly with time. See how it turns once mature!
I have seen ONE other blue eyed adult chicken.. it was a white Leghorn I believe, seen here..
https://www.backyardchickens.com/threads/blue-eyed-leghorn.1144270/#post-17822380
Cute chick, glad you're having fun!