Sure but unlike Tierney, Shaw actually does have the attributes needed to play as a CB, he’s tall (enough) good in the air, composed in possession, strong positioning. At least to my eye he has the attributes required for the role.
I also agree, Alaba was moved to accommodate Davies and I’m not suggesting we move Shaw to CB without adding someone else to the squad. I would like to see us bring in Reguilon for cover and competition at left back. If he’s a success then perhaps there would be opportunities to try Shaw at CB in certain games. All of this is likely pointless anyway as I don’t see Ole actually doing that, but all I’m saying is I think it could be an interesting experiment and I could see Shaw coming out the other side an a very exciting CB option.