You need not be the smartest, but the most consistent to be in the room to win.
Sachin Tendulkar stayed longer in the game than most of the batsman of his team. Hence, the god of cricket. There came many great talents & went, but very few stayed in for 20+ years.
There are many smart MBAs & PhD holders, trying to time & beat the stock market, but ultimately cannot beat Warren Buffett in wealth creation because Buffet is investing for more than 80 years now.
Smartness is good. Though, consistency is best.
Excellence is doing things consistently over a period of time that you naturally outbeat your competition once they stop showing up.