Sure, it sounds like something very fun that a child would do, go and spend a while pulling on the limb of an animatronic to try to remove it, get bored and then someone else comes to do the same, of course, now I understand why they turned it into an attraction that could be assembled and disassembled (sarcarm). Do you realize that the concept of a put together and take down attraction (which is what Mangle is) implies that it must be completely possible to put it together and take it down for the enjoyment of children? Otherwise, if it were so boring, why would anyone be interested in going to take it apart? That's an even worse excuse than the previous one.
Yes, that's a good point, however can you prove that it was raining when they arrived instead of the rain starting when they were already there? Furthermore, that would contradict
this, which literally happens in the same game.
Here it is argued that Afton hid not because he considered himself weaker than the animatronics, but because he wanted to be safe and be in as little danger as possible, but the decision to attack them and try to destroy them with his own hands contradicts the first supposed decision he made (trying to run as little danger as possible). The other possibilities (dismantling them after taking them by surprise and attacking their weakest parts) not only make more sense, but also do not contradict the decision to take as little risk as possible.
What weapons are the animatronics going to use? They are children inside heavy machines.
Have you seen his speed in that minigame? I've seen turtles walk faster. Btw, the crossing between rooms in seconds that the animatronics do in FNAF is considered a Game Mechanic. The animatronics' speed here is listed as "Athletic Human".
The animatronics have circuits inside, cables, and many electronic things that allow them to function (plus the metal rusts with water, and they spent years standing in a place where it rains inside the building).
Actually, that doesn't prove that the cameras are still working. If the power that powers everything was working, anyway some of the devices that are powered by it could break and others would not. Cameras can stop working due to exposure to humidity and all that, which is clearly in the building, probably the phone that was used (if it was used, I didn't see the scan to prove it) was simply not exposed to it, but we know that the cameras in those rooms were, since we see those rooms full of dirt and with water falling everywhere.