Like it or not, Look into this mans life beyond the fact that he is actually only 1/4 Jewish (His father isnt halachically jewish either, Only his fathers father is jewish) , His actions are a “Kiddisuh Hashem” if one can say that for someone who isnt halachically jewish , but everyone thinks he is jewish. He gives time and money to jewish causes, He stands up for jewish people like in Pittsburgh.
Being a famous Sports star can make a difference to many organizations especially with help financially
There certainly are Poskim (Like Rav Ovadiah Yosef) who would allow him to convert on a much quicker track than just some random person off the street