My "what ifs" consist of the very reasonable explanations as to why witness memory is flawed, how you are wrong to interpret it literally, how you are wrong to conflate hearsay with eye witness evidence and to assume they are all lying about everything, even the witnesses you have never read.
LOL! That's a good 'un, Nessie. A real knee slapper. Chil Rajchman wrote in his book that he witnessed the blood of 250,000 Jews rise to the surface from a 12 meter deep pit and burn for an entire night and a day. He also said that the air was pumped out of the gas/vacuum chamber before the exhaust from an IC engine was pumped into it. What is your "very reasonable explanation" for why his memory was flawed?
Rosenberg testified under oath that the steam/gas/vacuum chamber was hermetically sealed. That confirms Rajchman's statement since the chamber would have to be sealed in order for the air to be pumped out of it. Care to explain how both Rajchman's and Rosenberg's statements were "flawed" and not just bald-faced lies? Well, prolly not.
Such obvious lies are the daily fare of the witnesses to the so-called death camp and can't be explained by even your most bizarre "what ifs" and "coulda woulda's". "Very reasonable explanations" my shiny hiny.
You have thought up spurious reasons to dismiss the witnesses that do not suit you. You dodged explaining why you were happy to accept USHMM transport records without checking chronology, when normally you dismiss them as unreliable. You are very inconsistent.
The USHMM has used witness statements to create a chronology for the movements of those witnesses. They have NOT produced any documentation for that. As far as I know, Mattogno has found documentation for only 412 deportees being sent to Majdanek. Neither do I know of any documents other than the HOR-HUG decrypts from Bletchley Park that explain the shifts in the inmate population of Auschwitz. If you have more documentation than that, please enlighten me.
There is no reason to doubt the chronology of the transfers of deportees to various camps. Seems reasonable. What ISN'T reasonable is Mr. Black's statement that NO deportees, none, zip, zero, nada, reboarded trains and went to various destinations from Treblinka. In his book, "Belzec, Sobibor, Treblinka", Yitzhak Arad claims that nobody save the few who escaped after an uprising left Treblinka alive. That is obvious bullshit. I know of no qualified historians who claim that an orthodox narrative must be believed or rejected in it's entirety without discriminating between what is fact and what is possibly fiction.
The fact is that your puerile "what ifs" and "coulda woulda's" are nothing but piss-poor excuses for the lies of such as Rajchman, Wiernik, Rosenberg et al. They DON'T explain the impossibilities claimed for Treblinka being an extermination facility rather than a transit facility.
Fact is, your claim that c840,000 people were transported from TII over 13 months in 1942-3, to other camps, without that leaving any evidence at those camps, is physically impossible.
Fact is, nobody was steamed/gassed/vacuumed in hermetically sealed chambers. Nor were they buried in giant mass graves, exhumed and cremated on the magic Jew barbeque. Fact is that deportees were shown to have been sent to T-II, stayed for short lengths of time and were transferred to various other camps. That is derived from credible witness testimony. There is apparently NO documentation for any of that other than the records for the 412 deportees to Majdanek discovered by Mattogno.
There are two possibilities. The 850,000 were steamed/gassed/vacuumed at T-II or they were transferred to other camps/worksites. One possibility is reasonable. The other is the fantasies of holyhoax la-la land.