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Not sure what you're saying there?
The point of that plastic bit is merely to verify the BB width / spindle insertion depth is within spec. At least practically speaking... Shimano might say it's to stop the crank falling off, but if that's what it's doing, bad things have already happened.
The uneven splines mean the crank can only go on two ways. Which is better than one way... Not only for storage and second-hand shipping, but also for handicapped cyclists who pedal with their hands.
Kimmo
I guess it's a good reference. But since the splines aren't all even, it's only going to tell you if compression was right. It's probably not the best indicator for that either really.