exactly, because I do not think your first sentence is entirely accurate. There has to be some possibility of strategic planning or miscalculation, ir the system us boring because everyone will know the best team will always pick the weakest. My system allows that "weakest" team to calculate if it can play a spoiler.
The issue is MLB needs more Drama. "The point of the rule is to give the best team a big advantage" = no drama.
Example: Best team Y picks worst team X as its playoff pick. Everyone who pays any attention to the game knows X is the weakest. Ho hum.
Revised example: Team Y chooses team B, the 2nd weakest team. Team B can take its shot at Y or it can think it has a better chance of being a spoiler against team Z. (Should team Z have a right of refusal?) Once team B becomes matched against Z, Y then has to remake its choice, and can choose X (the weakest team) or W (the third weakest team) or could even choose one of the other division winners. (Division winners do not get to opt out of being chosen?)
I know this is convoluted and as a game design it might not work for some reason I am not seeing, but I do not think I am wrong in assuming that what MLB needs is some new and unique playoff system to pull fans back to the game toward the end of the loooooong baseball season. Spicing up how playoff brackets are chosen is one way to surely add drama. Like imagine, one season team R gets reamed in the playoffs by team J. Next season, both teams make it to the post season, but team J won its division, so has a choice. Team R also won its division, but J has the better record.
J feels dangerous. J picks to play R in the first division, this time in a BotB cage match.