If I went to all the trouble to look at the impeller and I had a new one already I would certainly not use the old one. The impeller in the picture looks in pretty good shape but remember impellers need to be changed when they are still operational. If you wait until they fail you will probably find that out when your engine blows.
As for the copper tube. It looks a little jagged to me like someone cut it or something. Mine is fairly smooth. My only concern with jagged would be if it binded on the grommet when I push the lower unit up into the mid-section. That would be a problem with water flow. Also, water flow can get hampered with the upper grommet, which might be defective. That unfortunately requires a powerhead removal to look at. You also might have a defective thermostat.
When you say you have no water peeing, was the lower unit submerged past the water pump all the way in the water. These pumps are not self priming. Also, on that model water only really flows well when the thermostat starts to open which usually takes a couple of minutes. Until then you need to put your hand under the little hole, in the back, and at best you will feel a light mist of water on your hand. That is normal for that model of motor.
