Tait is going to have to produce outstanding form considering double Olympic champion Mark Todd, Jock Paget and top class husband-and-wife team Tim and Jonelle Price appear to have a lock on the four positions.
Todd has his London 2012 team bronze medal-winning NZB Campino in Kentucky for the first time, however the combination has starts at other four-star events in Badminton, Pau and Luhmuhlen.
Tim Price was looking to go one better than his runner-up spot on Wesko last year, however the horse has been sidelined by injury. He has 10-year-old Bango in Kentucky. The pair finished fourth at Luhmuhlen in his first four-star start last year.
"Bango is a serious contender for the big events," Price said.
"He's a top quality horse and it's just a matter of time before he starts being completely established at this level."
Paget will ride Clifton Signature, an 11-year-old chestnut having his second four star start.
American-based Joe Meyer completes the New Zealand competitors, riding Clip Clop in the horse's first four-star start.