find the next guy who is young enough when hitting free agency and near the top of mlb performance. Trout had a blow away contract at the time.I don't know if there's a candidate now. Gunnar is too old. He may set the next record, but not $1 billion
Soto had so many things go right to get to this point. Youth, consistent mvpish performance, starring on the biggest stage and taking Yankees to the World Series, all of Yankees biggest rivals willing to spend like drunken sailors.
If Soto had finished out his team control years in San Diego and didn't have an MVP season, he's probably looking at 400-500 million.
Whether someone gets to a billion depends on how long teams like the Mets are willing to spend irrationally.