Plenty of underperforming players for sure. I thought you meant players who were "expected to look better in other teams", which I've only really noticed being said about Havertz.
When Werner or Lukaku were missing sitters left and right, nobody was saying they'd look better at Arsenal.
Maybe not at Arsenal explicitly but you'd generally expect Lukaku to perform better for Inter for example. To me it seems like Chelsea don't really think too much about how the player fits into their playstyle when they are convinced he's quality. Or maybe that they don't really plan in terms of systems to begin with. The philosophy rather seems to be "assemble good players and find out along the way how they fit together"