Well, Crappy Dad, I have a story for you.
Very condensed version:
Son had perianal abscess and inflammation/thickening at the terminal ileum. Tried Remicade and EEN, inflammation got better. While still on Remicade, ate more food. Inflammation exploded. Back to EEN. Inflammation goes back down due to EEN, including, most notably, inflammation at locations other than the terminal ileum. Over the next year, try dose increases on Remicade while remaining on EEN due to extreme sensitivity to foods that had developed at that time. Eventually get off Remicade, try EEN alone for a little while, then try Entyvio with EEN. Nothing gets rid of all of the inflammation, so he has a surgery. After surgery, inflammation is way down but not quite zero. Test food again. Food results in more inflammation. So we started Stelara, and since then inflammation has been totally gone, there's no thickened area, and he can eat normally.
Could Stelara have worked before the surgery? I don't really know, but I suspect that the surgery may have been a necessary step here. EEN was also necessary during all that time that we hadn't yet gotten things fully under control.
Semi-elemental formula worked better for us than polymeric, and I wish we'd known that earlier. Taste is only a little worse.