Gallo said the value he places on teamwork, winning, and effort is what separates him from others in the league.
But he also believes the 23-year-old can muscle it in the stats column as well.
"The Thunder is getting a player who is not even scratching his prime yet but looks to be one of the best two-way centres in the NBA for years to come," he said.
"Numbers may look different from night to night for Steven just based on how the defence is playing against the Thunder, but I think they know they are going to get 100 per cent total effort."
Gallo had spoken to Adams after the deal and said he wanted to stay in Oklahoma because it reminded him of New Zealand - even taking a potential pay-cut to make it happen.
He believes the Thunder star could have gained a maximum-level contract in the off season had he chosen not to re-sign with his team this week.
However, the way the organisation has treated him and his family makes it a place he loves, and a place he wants to be.
"There are good people here and it's a really good organisation," Adams said.
"Obviously it's good that (star guard) Russell Westbrook felt comfortable to sign again, it's kudos to the culture here and the environment that we have".