I have a theory, I could be wrong, but I think a roosters mating might mature hens faster, trigger hormones maybe? It's still a hypothesis but I'll see with these ee pullets if that's true
Do the scientific method. Have 1/2 of the hens with a rooster and the other half with no contact or vision of rooster. When your EE start to lay, keep logs as to which group laid how many. If your rooster group for instance laid an egg first, it may be coincidental. If your non rooster group laid first, that also is inconclusive. After lets say 3 weeks, when laying of eggs occurs, then compare your logged results.
Do not think of comparing your other hens first egg timing to these, since they are
different breeds. That is like comparing apples to oranges.
The timing of first egg laying also has other factors in play. The time of year chic is hatched and the following weather influence on chickens growth/development. In
your test, both groups would have
same hatch date.
There is nothing wrong with you having a THEORY, and a HYPOTHESIS.

,,,,,,,,,,,,,,,,,,,, That is how answers are obtained.
Consider doing it if even only for your self enrichment. Not sure how EZ to separate the groups for you would be.
