To fault Ewing for only being on one final four team because the previous year when they won the title, it wasn't a full field of 64 is fairly stupid. Going to 3 final fours and winning one championship is fairly impressive. It's fairly likely they would not have lost in their opening round game if it were a 64 team field since they were a #1 seed in both 1982 and 1984.
David Robinson clearly does not belong. Scored a lot, but never got to the final four. Kind of a minimum prereq, isn't it ?! The whole point of the tournament is to win it.
Cleaves and Dixon are pretty weak.
Also, the "can't choose between the two, so neither make the list" logic is about as dumb as it gets.
If you are making it about players who played in expanded tournaments, then it's actually pretty silly to include Ewing. You have to discount his previous years or you run into the slippery slope of having to consider how other players who played in a shortened tournament did. If this was just NCAAT players without the expanded tournament qualifier then he belongs without question. If you are going to make a qualifier then you should stick to it.