A G1000 install has dual AHRS and ADC units. In the more modern installation these are often combined so you have dual ADAHRS. To lose every G1000 AHRS you would have to pull both the No1 and No.2 breaker. If you pull the No.1 breaker in the Kodiak you get a CAS message letting you know everything is now running from just the No.2 system. Note that when you pull the AHRS breaker the ADC breaker automatically pops in unison. This is because they are joined as a single ADAHRS unit in the sim as I explained above. If you proceed to pull the No.2 breaker the CAS message clears but the attitude and airdata remains useable. No red X. You can however fail the whole PFD or MFD by pulling the relevant breakers. You then obviously have to use whatever standby instrument(s) your particular aircraft has fitted. In the later model Kodiak that’s modelled in the sim it’s the ESI-500 electronic standby but it could be 3 analog instruments.
So it seems G1000 electrical component power loss is either not modelled in the sim or the devs are not currently using it. Playing with in sim failures may yield different results.