There's no problem re you having the sensor 🙂 You should be able to get anything from 14 - 40 days from one sensor so at least it's a bit of help.
I've looked on the net and there is no mention anywhere about stopping the G5 so I wonder what is going on. There have been rumours for a while that Dex were going to stop the G4 transmitters as Animas have stopped selling pumps now. Your transmitter if it's the G4 will last a year
The G6 is ok but not as reliable as they claim and I as sure as hell would not make a clinical decision on the readings given. It can and has been 2 points above finger poke. It has got better as the days go by but still having readings 1.0 out from a finger poke.