Glut2/Glut4

- How come glut2 is said to be insulin independent if it senses the release of insulin to store glut2 in hepatocytes? - I understand that glut4 has a Km similar to the concentration of glucose so it gets saturated fast but how come glucose influx can still occur if the glut4 receptors are saturated? And what's the relation with it being zero order? Thanks!
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