A check of the record books has boosted the confidence of the Gai Waterhouse stable in its quest for the Magic Millions feature double at the Gold Coast.

Waterhouse is the record holder for both the Magic Millions Two Year Old Classic (1200m) with four previous winners and the Magic Millions Guineas (1400m) with two.

She has Cyclone and Echo Gal in the Classic and Sweet Idea in the Saturday's Guineas.

Sweet Idea had been favourite for the Guineas (1400m) until she drew barrier 15 but will probably start from the 11 gate after scratchings.

Statistics show the gate is far from a disadvantage and could even be an advantage.

At the past seven runnings of the Guineas no winner has come from inside barrier 10.

Also favouring the filly is the fact no favourite has won since 2002 and six previous Guineas winners have won at their lead-in start, as is the case with Sweet Idea.

Stable representative Mark Newnham said Waterhouse didn't worry about barriers but the statistics were interesting.

"Sweet Idea has the natural speed to overcome a bad alley and Gai has been happy with her this week," Newnham said.

The Classic is exactly the reverse with nine of the past 10 winners coming from inside barrier 10.

Waterhouse runners have been split with Cyclone having barrier one and Echo Gal 17.

"That statistic probably is a case of young horses not being experienced enough to overcome difficulties," Newnham said.

He said Cyclone should get a good run from the inside alley and he was the type of horse to win.

Newnham rode one-time favourite Echo Gal in a gallop before stewards last week and the filly, who had thumps after he inglorious run at her last start, has been cleared to start.

"She went well in the gallop and gave me a nice feel. Gai has also been pleased with her. But it will take a top ride from Tommy (Berry) to win," he said.