IanS;
For the timeline of the Mara Letter:
Rather than pollute the thread with redundant text, I'll link to the post where I discussed this matter with Aepervius:
Post #2865
Regarding the earliest copy of the letter: it is around the 6th or 7th c CE.
I cannot rule out the possibility of forgery, as I am not equipped to establish that and have to therefore defer to specialists in the field who verify authenticity and trust their findings that the letter is authentic.
If you do not, I cannot fault you for such, but if I doubted the authenticity verification, then I would personally be in debt to use the standard authenticity methods to disprove the authenticity granted to this letter.
I cannot disprove the authenticity validation of this letter, and the only conclusion that I receive on the authenticity of this letter is a generalized stance that there has been no evidence in the text to suggest that the letter is a forgery.
Regarding the dating on Suetonius:
Suetonius' text existed in regular manual copy after copy with a near unbroken stream until the printing press age in the 1500's where it became a regular printed text until it began its English translations in the 1700's.
Suetonius actually has a better track record than most documents from ancient times, and has been used nearly always as the chief text that historians in nearly all ages since have used to account for the majority of Nero's reign.
Regarding Personal Witness:
I cannot claim either of these texts as personal witness accounts; nor did I offer them as material evidence for such an assertion.
To my knowledge, we have no such (non-bias) text or archaeological scratching by anyone who personally witnessed Jesus.
I do not personally see this as a problem, as I regularly involve in readings that are accounts by those who did not have personal witness to the individuals they are writing about.
For example, Suetonius did not personally witness Nero, as Nero was already dead by the time Suetonius was born, and definitely so before Suetonius wrote anything about him.
Other such examples, to use it again, are those such as Hippocrates, Pilate, Herod, pretty much all of the kings of Hatti, or all accounts of the ruling class of Petra.
So this in and of itself is not something that stops us from formulating historical accounts as a standard.
If we did that, then we would have far less to cover on my tests (Hey, wait a moment...I like that idea! I wonder if I can argue that to the professor this fall?

)
When I presented these texts, I offered them as evidence of non-favor-bias sources as representation samples of what others outside of the in-favor-followers considered to be the state regarding the existence of Jesus.
Did they assume he existed, or did they assume no such figure existed?
I offered these two pieces of material as evidence that suggests people outside of the in-favor-bias followers held the opinion that such an individual existed.
Can I rule out a conspiracy to create a Jesus by ancient scattered and non-unified followers that accurately fooled the Mediterranean world at large?
No. I cannot rule that possibility out.
I don't see this as very plausible, and I would be interested in a presentation that shows a tangible means by which that could be the case that produced what we see, as that would be a really marvelous entry into anthropological record and a brilliant talent that should not go without award and notice.
I'm not being coy either; I mean that with all earnestness.
I don't personally care if Jesus existed, so if someone can show how it was a grand conspiracy by a mass of dissimilar people that fooled a massive amount of people, being that my bias is social anthropology (and not individual historicity), I would be absolutely thrilled far more with that being the case as it would really show a level of ingeniousness that I feel should be marveled over; and such a case should absolutely be given its due credit in history if it took place.
I mean, that kind of craft and skill (should that be the case) should really not be overlooked and neglected mention.