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human
[Stargate] Why does Teal'c believe Jack can stand against the Goa'uld?

Just watched Children of the Gods (the first episode of SG-1) the other day for the first time since I was like ten, and despite your typical small/funny incongruities (the guys in tech couldn't figure out the obvious on/off switch on a staff weapon?) it's very solid on the whole. 

But there was one scene I really had a problem with: the Jaffa of Apophis, led by Teal'c advance on a disarmed SG-1 and the hapless offerings to the gods they were thrown in with, and Jack says "I can save these people, help me," to which Teal'c responds "Many have said that... but you are the first I believe" (both paraphrased) as he turns on his own men.

Is there a Watsonian explanation for Teal'c's declaration here?

Because it feels like there's a missing scene where Teal'c and Jack speak (perhaps in context of an intereogation) and Jack finds out about Teal'c's misgivings about his gods and his job while Teal'c finds out about Earth's vast population and industrial capacity, or perhaps that Ra died by Earth's weapons and Jack's hand.

But without such a scene, Teal'c has had three interactions with these new people and their technology:

1. Taking a host candidate from Earth, where a small squadron of Jaffa easily defeated a small squadron of airmen with assault rifles, abducting one and killing the rest at the loss of two Jaffa. Reinforcements numbering perhaps twenty arrived but were apparently unwilling to engage the Jaffa, as they and Apophis withdrew unmolested.

2. Taking host candidates from Abydos, where a small squadron of Jaffa engage in a fairly one sided roflstomp of mixed forces of Airmen and Abydonian tribesmen at the loss of one Jaffa.

3. Taking SG-1 prisoner without a fight on Chulak.

None of these strike me as confidence inspiring encounters, and while Earth DOES have other fun things at their disposal that aid them greatly as early as by the end of the episode, none have yet been seen by or mentioned to Teal'c, nor is he, to the best of my knowledge, aware of the circumstances of Ra's death or the defeat of his Jaffa. 

Is an explanation ever offered for this?
gpt
About 5 mins before that, Teal'c identifies Jacks watch as none-Goa'uld technology, upon asking where they are from, Daniel draws the gate-symbol for Earths point of origin. Teal'c clearly doesn't want his colleagues to see this as he erases it with his staff.

In the next episode, *The Enemy Within*, Teal'c tells of an old legend of the world of the Tau'ri, the planet in which beings of this (human) form first evolved. Who were enslaved by the Goa'uld until they rose up and overthrew them.

I believe that Teal'c already suspected that these people were the Tau'ri, the humans who once successfully defeated the Goa'uld, now having had thousands of years to develop unrestricted. He didn't have confirmation until Colonel Kennedy informed him that humans evolved on Earth, but the humans with strange technology and that address sure seemed to get his hopes up.