The Power sit top of the ladder, winning 10 of their 13 games, but Brown believes they have reached their peak and were found out against Geelong last week.
“I think they might struggle a little bit, they really got found out last weekend against a top notch Cats side.
“They lose a couple of players due to the COVID restrictions – [Peter] Ladhams has been pretty serviceable and [Dan] Houston has been a star on the half-back line.
“They need to get a few more options up forward because if Charlie Dixon doesn’t play well, they really struggle forward of centre.”
“Right now where we sit I think only four sides can win it,” he said.
“I’ve still got the Cats as the favourite no matter where the game is played.
“I’m very confident the Grand Final will be at the Gabba and it certainly gives the Brisbane Lions an advantage as well.
“Richmond obviously are starting to build pretty nicely and the West Coast Eagles (are the other team that can win it).”