Thrust Block with 489 Sure Grip

So with the Green bearings, the thrust block is optional? In other words, it's simply for end play adjustment and doesnt HAVE to be removed if Green bearings are being used?

I bought the axles and bearings used so I dont really know how it all goes together at the moment. Something I did notice is that the bearings dont roll so easy, is that normal for Green bearings? Are Green bearings sealed or do they need to be greased?