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@Gordon
Hi, I think that if anything, the fact that the LEDs blink in sequence probably means that it's wrong.
See this picture
So that picture shows 1,2,3,4 in sequence - but if you compare that with your datasheet the order of the coils is different. In yours, and in most steppers, opposing sides are right next to each other so the order should most likely be 1,3,2,4 instead.
And it isn't connected to a gear, but there is a 64:1 gear inside it. That's why the shaft doesn't come out of the middle.