I made some major corrections for the last Rocky Recovery info dump, but here's the relevant supplementary material:
Rocky requires gravity for his entire eating process, which lasts at least 3 hours. There are big problems if the Hail Mary was in microgravity, but it isn't. It's just in a lower gravity than Rocky's used to on Erid. Short term there shouldn't be any problem, but there would be repercussions to 4+ years of incision and healing of the abdomen fissure under lesser gravity.
Grace and Rocky could have averted this problem if they turned on the centrifuge to 2.03 g every time Rocky ate, but it's such a tedious and energy consuming process that they probably wouldn't bother. I don't think Rocky would've noticed the difference in gravity affecting their eating anyways, and if he did he wouldn't be willing to subject Grace to more Situations(even more gravity) than strictly necessary. It's only obvious in zero g because, well, no gravity.
The result is a weaker immune system and a struggle to kill deadly pathogens from his biosphere. Ergo Rocky's immunocompromised, ergo major problems with his digestive system. By the time Rocky actually feels this backlash, which is maybe a couple months until arrival to threeworld, I think he would just power through the pain. Between Grace and Rocky at least one of the two has to be as stable as possible.
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