Rice has a ton of other strengths that work nicely at 6 though. It all depends on combinations. A lot of the time Rice played 6 last year was with an unconfident Havertz at LCM (not to mention a weak left side and ineffective Jesus/Nketiah up front).
Rice-Merino-Ødegaard could be a great midfield, with Merino taking more responsibility for some of the simple buildup passing. Rice will also become a more complete player this season.