I'm of the opinion that this is an example of Swamp Pink. However, just the mention of pickerel, as you mentioned in pickerel grass, makes me feel good because it brings back memories of fishing in Southern Ontario. Lakes in cottage country, that is within the Canadian Shield didn't support many pickerel and so we used to refer to walleye as pickerel, even though they are not true pickerel. Catching a walleye was satisfying enough, but getting a pickerel was rare. The best place for pickerel is usually the same grassy shallow lakes that also support the much more successful pike.
I really don't come across Swamp pink all that often. I took a shot of it a few years ago when I found an example somewhere along Duffins Creek. I don't know why that is. You know, I have a heavy sack full of things that I don't know about. Every time I unpack an unknown and research it so that I can eliminate it from the sack, someone sneaks a dozen more things into the sack that remain a mystery to me. I'm guessing that you don't have any other ideas about the plants I posted before, mostly on your behalf, since the bots on this forum that are trying to get through the gates, like barbarians, have no interest in plants, except maybe planting data bugs for surveillance. Oh, dose Russians!