Because the cream rises to the top. Even backups will get their chances over 162 games. If they outplay their expectation, they'll get more playing time. If they continue to perform during the course of that additional playing time, they'll move into one of those starting spots. Or, they'll have trade value. I don't think we're suggesting vastly different things. It's just that you suggest "forcing" the issue, whereas I suggest letting it come naturally. No two players have equal talent and ability. If it appears they do, then they simply aren't being evaluated with enough digits after the decimal point. There is no such thing as a true "tie" in a race. If you keep adding past the decimal point, you'll eventually find that one participant was faster than the other. I want the faster guy in the race, even if he's only .0001 seconds faster. 26 guys of equal ability just isn't realistic.