1 I just used the bikes with the wheel that was on them. I didn't want to move my 11spd wheel to my 10speed setup.
2 I wanted to know why it was different. If flimsy Ti skewers took him through tons of sprints on this wheel on two bike why now when using a steel skewer did his wheel come out.

Answer - because its like a steel slotted dropout and needs to be very tight.
These hubs were not designed for steel slotted drop outs
My son has never seen a steel slotted dropout and likely tightens like most racers tighten.