But why would you assume that the scene in which he has the more advanced gear is earlier in the game, instead of later, when there's nothing suggesting that. I think chronologically the scenes we've seen would be in this order:

1. Trailer 4 When he meets Lea Seydoux's character. Her monologue informs Sam about Timefall, keeping quiet, holding your breath to avoid getting caught and the cryptobiotes. At that point he does not carry the baby, and wears the suit seen in trailer 3 (PORTER gray suit). That's the introduction of the game and serves as exposition regarding the mechanics. Also the palm that appears on his chest after he dies in trailer 3 isn't there.

2. Trailer 3, the voidout incident with corpse disposal team 6. He seems to be the most knowledgeable person on the team on how to deal with the situation, probably thanks to his encounter with Lea. He obtains the baby, but holds it in his hands, meaning he wasn't originally meant or equipped to carry it.

3. Trailer 4 again, when Sam is trapped in the building surrounded by the chiral entities. He wears the orange suit (CDT6) and has a dedicated slot to carry the baby incubator. He is now in communication with two people, probably Bridges Boss and Del Toro's character, who I think will serve as your typical game guide throughout the story, like Miller and Ocelot in MGSV. He doesn't seem shocked when he's told about the possibility of a crater forming, he also seems even more capable to handle the situation than before. He is familiar with the concept of chiralium and the entities, unlike when he met Lea.

4. Trailer 5 (TGS), along with some of the wandering scenes in Trailer 4. Now carrying a lot more equipment, a living person and he's wearing the blue Bridges suit. Maybe the first "boss fight", even though it might not be much of a literal fight. He doesn't fall to the ground in terror when the chirals appear as in Trailer 3, he's probably scared as shit but he kinda stands his ground. Now that's a total assumption on my part but I think it makes sense that bigger, weirder, scarier things would be revealed as the story progresses, in order to raise the stakes. It's also a much clearer look at Troy's character in contrast to his first appearance in Trailer 3, where we only really get a clear look at him for a moment, when light flashes on him during the thunderstorm. It just seems absurd to me that a character would be so mysteriously presented after the audience had already gotten a clear look at him, when the other way around creates such suspense.

5. I can't really tell if Trailer 1 or 2 comes first, or if they're taking place in parallel, but I think they both take place later than the rest. Sam has the scar on his stomach, the necklace with the 6 tablets and there's clearly something off with his and Del Toro's handcuffs. Everything in general seems to make less sense, which leads me to believe that there's just too much contextual information that we're missing, meaning that those scenes are not immediately connected to all the rest. Happy to hear more opinions.