You suppose my understanding. Of course you know your own.
I do not suppose your understanding but instead work off your posts.
You rightly believe the crucifixion to be an historical event. This means it falls into a historical timeline.
Historical facts:
Twilight at start of 14 Nisan passover killed outside of Jerusalem
Twilight at end of 14 Nisan passover killed in Jerusalem.
Our positions:
You place Mark as speaking of the passover being killed in Jerusalem proper by your own account.
I place Mark as speaking of the passover being killed outside of Jerusalem (of Mark writing of what he was observing at that time).
We disagree about which historical event Mark was speaking.
History is objective.
You chose one historical practice being observed and I chose another historical practice being observed.
The reason for your choice is not my concern. It is not necessary for me to know
why you chose the second event nstead of the first in order to place your view within a timeline.