[Leonidas]

the playing field is not equal, but in 5th grade a great player may still be timid or lack confidence, or maybe a lineman hasnt found his feet, or they just havent matured as fast, no playing time might discourage a potential, great player from going to the next level. And some of tour best players now might not even play in highschool

Then they should learn discipline, integrity, heart, work ethic, and all of the things that come with beating the man in front of you to earn a starting spot, instead of all this everybody should play crap.

I think you should be able to work all kids in, maybe not in units but rotate on or two at a time

You earn the spot in practice...see above.