Under this plan, either 13 or 15 existing teams, in effect, would have to change leagues.
But Colangelo has said he would refuse to change leagues.
However, any team that would be asked to change leagues can veto the move.
That left the Milwaukee Brewers as the team most likely to change leagues.
Brooklyn changed leagues following the 1889 season, joining the National League.
"It's been stressful, having to move, changing leagues and teams," he added.
Rafael Palmeiro had the highest average among players who changed leagues.
The next season, even though he changed leagues before it ended, he led in walks.
Now none of the four seems in danger of having to change leagues.
After the 2005 baseball season, the Pioneers changed leagues.