>I think for that particular query we found that combo index is the winner. So, we get rid of other index and keep this one - at least that's how I'd try it. If the performance of other queries will decrease, we may add plain index back in.

I have removed the index on NoMember. IndexCombo1 is based on NoMember with the INCLUDE on NoThread. So, as you said, as this index on NoMember is already taken care of in IndexCombo1, we will see how it goes.