Sorry but nope its not , you dont have to see the legs , this bird has both the breeding plumage of the egret , not the heron , and the bill on a heron is straighter on top with the lower curving up to it.
( theres other differences as well ) keep looking though , they arent exceedingly unusual down there. I got one on merritt island even.
Frankly Id rather get a shot of a Würdemann’s Heron, which is white morph great blue with dark morph great blue.
I didn't think it was, but I wasn't going to argue with the guy. The last couple of years there was a Wurdemann's hanging around, but not when I was there.