While 2023 was dominated by Max Verstappen and Red Bull, McCullough suggests that in the third season of the current regulations, the top teams will be closer together.
He cited qualifying for the final race of this year in Abu Dhabi, where eight teams featured in the top 10, as a guide to the direction that the series is taking.
"If you look at the fact that there were eight teams in the top 10 and how close qualifying was, that's phenomenal, isn't it really?" he said.
"And it just shows you that with stable regulations there's always an element of convergence.
"Some teams have developed really well this year, but I think they'd be the first to admit they started badly as well. So I think next year, it's going to be fantastic for the sport.
"I think trackside execution is going to be important, and I don't think the margins are going to be enormous.
"But everyone's trying to get that extra 10-15-20 points [of downforce] more than everybody else because that just gives you the advantage on track."
Source: Autosport