So a friend of mine son will be 18 next week, he should've graduated in 2023. However he had his kid go to kindergarten twice, so back then i asked him he said he wasn't mature enough to go to first grade HAHAHAHAHAH. My friend and his wife are both teachers and they were both college athletes. They new at 5yrs old they should reclass him thinking the advantage it would give him being a year older. Unfortunately it didn't pan out he will play in college on the D-3 level which is great but its not what they thought was going to be the outcome.
What exactly is your point? Are you responding to a particular post?
Starting Kindergarten late, repeating kindergarten, repeating 9th grade, PGing etc... are nothing new. I went to college in the mid to late 80's and had friends/teammates who fell in each of the above categories.