Davies is short term cover, Udogie may well be suffering from a structural physical issue that means he will have to be rotated. So Robinson makes sense as well.
Souza is a prospect - whom if we keep him, will need a season or two of settling in and transition.
So it really doesn't surprise me.
If we look back and see how many times in the last two season we've had to play square pegs in round holes, it does ultimately mean we have two players for every defensive position and one or two who can also play further forwards - the fear of getting caught out by injuries again, is a real one.