"It created some internal issues. We had to finalize the last points. Unless it's done, it can't get announced," Loeffler said. "It got worked out with concessions from both sides."
The first bout, on Sept. 16, was ruled a draw after judge Dave Moretti scored it 115-113 in Golovkin's favor while veteran judge Adalaide Byrd ignited a firestorm of controversy by giving the more popular former two-division champion Alvarez 10 of the 12 rounds with a 118-110 score. Judge Don Trella had the bout even, 114-114, as did the Times in its unofficial scorecard.
Golovkin (37-0-1, 33 knockouts) tweeted, "We won't need the judges," for his defense of his World Boxing Council, World Boxing Association and International Boxing Federation middleweight belts.
"I am ready to battle Canelo again and happy he took this fight," Golovkin wrote in the prepared statement. This is the fight the world wants. This is the fight boxing deserves. This time, there will be no doubt. I am leaving the ring as the middleweight champion of the world."
Golovkin was visibly upset by the judges' scores in the first bout.
"He's been ready for this rematch since the last fight," Loeffler said of Golovkin, who'll turn 36 on April 8. "He didn't agree with two of the judges' cards. He feels he and Canelo owe this to the sport of boxing, and now that the deal is done, he'll make an even more emphatic statement on the outcome of this bout.
"When you feel you've won eight out of 12 rounds, it's hard to criticize yourself, but I think he'll start faster and no one expected Canelo to move for 12 rounds straight. Gennady will be prepared for that movement this time."
The 27-year-old Alvarez (49-1-2, 34 KOs) will likely be backed by a strong crowd on Cinco de Mayo weekend, although Golovkin has long been a favorite by Latinos given his study of and fighting resemblance to Mexican great Julio Cesar Chavez Sr.
The lack of a rematch clause may ultimately complicate a possible trilogy bout, especially with the presence of World Boxing Organization middleweight champion Billy Joe Saunders and former WBA secondary champion Daniel Jacobs available as alternate foes whose bouts are also televised by HBO.
"Eric (Gomez) and I agreed, let's get this deal done and then we'll go from there," Loeffler said. "Gennady needs Canelo and Canelo needs GGG to do these kinds of numbers at the gate and on pay-per-view.
The first bout generated in excess of $26 million in live-gate revenue, with an estimated 1.3 million pay-per-view buys, creating around $80 million in total sales.
De La Hoya said without losing the dollars that were taken away by the Floyd Mayweather Jr.-Conor McGregor novelty boxing match three weeks before the first Golovkin-Alvarez meeting, the rematch could generate "as close as three times" more revenue this time.
"There's nothing serious that will interrupt Cinco de Mayo," De La Hoya said. "Canelo and Triple-G are proven commodities. They've proven the first time around was a real, great fight, and I believe this fight will be greater.
"Canelo will be able to adjust, and the fact he did so well late is a big deal. Canelo is only improving. ... If Golovkin wants to prepare for Canelo's movement, he better also prepare for his aggressiveness, or Canelo will knock him out."
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