Hi! i'm not sure what to do with "à sa suite". Here's an attempt:
"One will also note that the ceremony of RM 65 is reproduced in a lacunose fashion, while some new elements are gathered in its wake? "in what follows"?
This is from a commentary discussing how the Rule of Benedict adapts the monastic rituals (ceremonies) it takes from the Rule of the Master. In this particular instance, it rearranges the parts of the ritual for welcoming guests that it takes from the Rule of the Master and then adds other new elements to it.
I agree that lacunose is not commonly used, but haven't been able to find another good word. "Slapdash" seems too informal for this context. I'm not sure if "hit and miss" is any better. The author is saying that he leaves a lot of stuff out.