Well if people are interested I could write out my canon playthrough with thoughts why, when I am done with the TLDR. One warning though it would be a serious wall of text
One thing that does surprise me a bit though is that I have not read any suspicion about our sweet Rarah flirting with the good Loot. We all know Sarah is smart enough to know what is in her service record and what that means. Everyone who took her to that cave also know she is good at getting her way.
Would it be possible that she decided that getting in MC's good book and flirting with him and maybe more might be a good way to get a commendation for the mission or maybe a transfer to engineering what she def has the skills for. If the last it is not impossible at least Annie is also in on the plot since she gives Sarah plenty of opportunities to shine as an engineer.