Lol. When did Noel ever have guard skills? He barely has big man skills.
Stop thinking about positions as the set roles of the past. We aren’t talking about him as a 5 as in he should be backing guys down in the post. We are more talking about defensive positioning. He should be playing more in the center there, disrupting the offense with his length and foot speed, not on the perimeter.
also look at current centers- Jokic, Cousins, Gasol, KAT, etc. They are doing a lot of “guard” things now.