Then you have surely seen this one:
Seems like you do not understand it, but usually players do NOT mix heat weapons with energy weapons except for raids.
So you need to view their profiles when they are doing the raids to know what items they have in reserve in their inventory.
Edit: So once again, wait till after raid tier 6 tomorrow before you call others cheaters.
Only if the raid tier 6 tomorrow is still impossible to complete without taking damage like it was last time and then there are players who manage to complete it perfectly again you can start to call them cheaters if there is no explanation how it happened.