I didn't want to give a reply to every section of your reply, but I will be touching on many things which we all agree on and understand.
To set a base...
Passover always falls on the 14th of Nissan and is eaten on the 15th of Nissan.
Exodus 12:6-8 And ye shall keep it up until the
fourteenth day of the same month: and the whole assembly of the congregation of Israel shall
kill it in the evening. And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it. And they shall eat the flesh in
that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it.
The 'evening' (also translated as twilight) is still the 14th. the 'night' is the 15th.
Leviticus 23:5 demarks the 14th and the slaughtering of the lamb at twighlight and Leviticus 23:6 demarks the 15th where the festival of unleavened bread starts.
The Bible states that Passover is on the 14th of Nissan, yet the Jewish calendar shows Passover starting the following night!
www.chabad.org
In this article, you will also note how they call the 14th a 'Long Day'. In essence, as far as passover, '
that night' also belongs to the 14th
Leviticus 7:15 is also associated with the Passover commandments.
Exodus 12:8-10 And they shall eat the flesh in
that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it. Eat not of it raw, nor sodden at all with water, but roast with fire; his head with his legs, and with the purtenance thereof. And ye shall
let nothing of it remain until the morning; and that which remaineth of it until the morning ye shall burn with fire.
Leviticus 7:15 And the flesh of the sacrifice of his peace offerings for thanksgiving shall be eaten
the same day that it is offered; he shall not leave any of it until the morning.
It is these two verses that primarily make up for the 'one long day' which means the night of the 15th is also the second night for the 14th because the second night of the 14th belongs to the day the lamb was slaughtered (Leviticus 7:15 - Exodus 12:8-10).
Now, concerning Passover days, they can fall on any given day of the week depending on the lunar cycle. here are the days for upcoming Passovers. We see that in 2023, 14 Nissan falls on a Wednesday.
Here is another lunar calendar that shows Nissan 14 from AD 22 - AD 36 and as the calendar shows, Passover falls on different days of the week each year. The two viable years for the crucifixion are AD 30 which fell on a Wednesday and AD 33 which fell on a Friday.
In addition, between AD 22 and AD36 Passover did not fall on a Thursday which pretty much eliminates Thursday as the day of Jesus Crucifixion.
www.studiesintheword.org
How does the Sabbath play into all of this?
Let's say you opted for a Wednesday, 14 Nissan Crucifixion. The 15th would start the feast of unleavened bread which means Thursday would be a special sabbath (Leviticus 23:7)