There is a canon story to the Mass Effect trilogy and the choices you make that are not canonical are only deviations from that. Wrex can be killed by Shepard or Ashley on Virmire and one of those scenarios will be non-canonical. I've been looking at the default settings for Mass Effect 3 and thinking how Mass Effect 2 had to play out for those things to happen. You must have had to have done some missions after the Collectors took the Normandy crew because only Chakwas survives.
There is a canon story to the Mass Effect trilogy and the choices you make that are not canonical are only deviations from that. Wrex can be killed by Shepard or Ashley on Virmire and one of those scenarios will be non-canonical.
I've been looking at the default settings for Mass Effect 3 and thinking how Mass Effect 2 had to play out for those things to happen.
You must have had to have done some missions after the Collectors took the Normandy crew because only Chakwas survives.