No one would have predicted Ben Brown would be the Cubs’ best pitcher two months into a championship-or-bust season.Brown landing in the All-Star Game after a woeful 2025 campaign would have been an even more outrageous prediction.But here the Cubs stand in early June, and Brown is the most obvious candidate to represent the club at the Midsummer Classic.“Just to think about the arc of the last two months,” Brown said Tuesday, “to see that would…