Temp sensors questions

Looking at what I have with my Maximus X Code, here's an HWInfo screenshot:


So why is T_Sensor1 still under the ASUS EC but you can still use it as a monitor temperature in the BIOS? I thought T_Sensor1 is a non-EC sensor?

Also, from what I can tell:

T1 = Motherboard Temp
T2 = CPU Temp

Why are there two sensors of each (duplicates)? What are Temp4 and Temp5 (they don't seem to be moving at all)?
T_Sensor1 value is read from the EC.
T1, T2, Temp4 and Temp5 are values from remaining sensors, which are not officially reported by the mainboard. So those might be just duplicates, or invalid.