Jayson Tatum spent much of his career hearing from critics who said he and Jaylen Brown could never be an effective combination, but he tells NBC Sports Boston that he and Brown never had any doubts (video link). Responding to a question about how their legacy might look if they both spend their entire careers with the Celtics, Tatum said his focus is more immediate. “We just try to stay in the moment,” he replied. “It’s not necessarily about our legacy will look like if we did this or that. Just trying to be the best versions of ourselves, the…