Too good a footballer to be looked upon as a one position def mid imo. He is worthy of his place for his passing ability irrespective.
He is a level better than Gundogan imo, full stop. He always looks to move the ball forward as the first option, which G doesn't, he's close to Fern level at recovering the ball & he showed last week, he could shoot if we want him to.
So imo, unless he needs rest, he should be in the team ahead of Gundogan, even if Fern plays. If Gundo then wins back that job, fair enough.
No comparison at the moment. Rodri is currently more consistent on the ball than KDB.