He said the famous words didn't he, Bielsa told him right off the bat that he's a 4, not an 8. But under southgate he played as an 8, and became england player of the year. Rodri only became the best defensive midfielder in the world the season Kalvin joined. So he's unlucky in not getting game time.
He simply needs more games, play for the reserves, get a few subs appearance to get back up to speed.
I remember when Scholes was still playing, not much people were saying he's the best midfielder. but now he's the role model in La Masia, etc etc etc.