No. The only countries that aren't members are North Korea, Eritrea and Turkmenistan. There are a couple of observers that overlap with some of the grey, but some of them also voted (South Sudan, Sudan, Somalia, Bhutan, Ethiopia, Equatorial Guinea, Bahamas and East Timor).
Are the grey countries just not a part of the WTO?
No. The only countries that aren't members are North Korea, Eritrea and Turkmenistan. There are a couple of observers that overlap with some of the grey, but some of them also voted (South Sudan, Sudan, Somalia, Bhutan, Ethiopia, Equatorial Guinea, Bahamas and East Timor).