1910 - Ted Grant is born.
1923 - 13-year-old Ted is orphaned & sent to a work house.
1925 - 15-year-old Ted escapes the work house & lives on the streets.
1929 - 19-year-old Ted saves the life of heavyweight champ "Socker" Smith, who takes him in and starts training him.
1931 - 21-year-old Ted begins his professional boxing career.
1938 - 28-year-old Ted becomes the heavyweight champ.
1940 - 30-year-old Ted is framed for the murder of Socker by his managers Flint & Skinner. He survives a hit while in police custody that kills 2 cops. Now a fugitive, he becomes Wildcat & clears his name.
1945 - WW2 ends.
1951 - The Justice Society is trapped in Ragnarok, including 41-year-old Ted, who dies trying to escape.
Ted Grant is a less ubiquitous presence in the Golden Age cannon of characters. He's less famous for his own exploits than for being the guy who seems to train every other hero known to fight with their fists. Still, even within the limitations of that role, he's very solidly remembered as a part of the World War II era heroes, and his origins are a stellar example of the type of character that was so prolific at the time.
So we're left with a specific choice to make: do we keep him as a WWII era character, and remove the idea that he helped train characters like Black Canary and Batman? Or do we move him from the Golden Age and make him a member of the All-Star Squadron, allowing him to have that connection to the modern age? It's worth pointing out that he did have a son, a character that somehow (they never go out of their way to explain how), is a metahuman werecat. The design of his son comes from the series Kingdom Come, and like most designs native to that story, it's best off left there.
Ultimately, the ties to the Justice Society are more fundamental to the character, and the team itself is more interesting with him in it. The modern characters that have benefited from his training don't really lose anything narratively important beyond a clever tie to the past, and the DC continuity as a whole is stronger for having a stalwart archetype like Ted Grant laid in it's Golden Age foundation.