Bringing up the 6% number tells me you are not an infectious disease researcher, at least not a good one. The statement "CDC say that only 6% of total deaths were from only covid" is incorrect. The CDC said that 6% of death certificated ONLY listed covid. Since covid kills by causing the failure of one or more bodily system, there really shouldn't be any death certificates that lists only covid, there will always be something else.
If you look at the full list of causes listed on the death certificate, you will find that a lot of them were things that were caused by the virus. If a person had "respiratory arrest" listed on the death certificate, meaning they stopped breathing, it's pretty likely that it was the virus that lead to that. Even people with true pre-existing conditions, diabetes for example, could have continued to live for many years with that condition if they had not caught the virus.
Bottom line, most (although probably not all) of the people who have died from covid would probably be alive today if it had not caught the virus.