I know nothing about the gyre, BUT, I DO know a bit about seahorses.
Seahorses have NO requirement for low to moderate flow. When I FIRST started the hobby in 2002, it was THOUGHT that with seahorses rudimentary movement capabilities, low flow was necessary, but, it wasn't long before that theory was discarded and replaced by the recommendation of a minimum flow of 10X tank volume. Many of us long term keepers are more in the range of 20X and more.
I like to have areas of low, medium and high flow with hitching available in all areas so they can choose as individual just what they want at any given time.
For me, it's important to have sufficient flow to keep detritus and food in suspension long enough to get it taken up by mechanical filtration to lessen the amount of personal physical work to remove such before decay sets in.