Did Pilate's Governorship actually begin in 17 or 18 AD?

Here is an article on the subject arguing it could be the case based mostly on Roman Coinage.
http://www.academia.edu/8296217/The_Chronology_and_Tenure_of_Pontius_Pilate_New_Evidence_for_Re-dating_the_Period_of_Office._Judaea_and_Rome_in_Coins_65_BCE_-_135_CE._The_Numismatic_Circular_pp._1-7._Kenneth_L%C3%B6nnqvist

There is a potential argument for this model from Josephus I have noticed that I don't think that article included.  Which is notable because something Josephus said is also basically the sole reason for the more common 26 AD date.

In Book 18 of Antiquities of The Jews, the last thing Josephus talks about at the end of chapter 2 before introducing Pilate in chapter 3 is the Death of Antiochus III of Commagene who died in 17 AD.  The first three sections of chapter 3 are stories about affairs when Pilate was Governor, one of them being the Crucifixion of Jesus.

Then section 4 begins a long account of calamities that befell the Jews and Egyptians in Rome.  Tacitus Annals II records those same events, his Annals are explicitly year by year and he places them in 19 AD (the Year of the Consulship of Silanus and Balbus), the same year as the death of Germanicus.

Now the above article stresses how this need not change assumptions about the chronology of The Gospels, they're expanding Pilate's administration not moving it, he was still governor during the Passovers of 27-36, with myself long favoring the Passion being in 30 AD.

However I have been flirting with the possibility of moving it down.  It would make my arguments for sooner Nativity Dates (Like 12 BC or 25-22 BC) even more plausible.

Apparently Tertullian had said there were 52 years between the first Advent and the fall of Jerusalem to Titus.  Which points us to 18 AD.

What about the 15th Year of Tiberius?  Well I've already said more then once that Jesus Baptism could have actually happened before that, it's simply when John was arrested that happened then, which I do view as possibly merely months or even weeks before the Passover of the Crucifixion.  And it could be Luke was using a source counting from when Tiberius truly became Augustus's Heir in 4 AD which can give us a 15th Year that begins in 18 and ends in 19.

As far as the 70 Weeks goes.  The same chronology for Artaxerxes that has 483 years from his 20th year be the Nisan of 30 AD, could bring us to 17 or 18 AD if we used the Decree of Ezra 7 which was his 7th year.  However I still strongly feel only the Nehemiah Decree can fit the requirements of Daniel 9, so I shall remain favoring a 30 AD Crucifixion.

But regardless of my Crucifixion model, I am interested in this theory about Pilate.

Update March 2024: The Article is behind a Paywall now and it's older versions wasn't properly archived.