Bellingham isn't a holding midfielder, though, he plays attacking mid.
When southgate was doing a Cooper and playing 3 CBs, then 3 in midfield, England's creative outlet was diminshed somewhat.
Ever since the big Semi against France, he has seemingly opted for a Nuno-esque 4231.
Within that formation, Bellingham (not that he isn't good enough to do the job of a DM) plays as an AM/No.10.
2 wideboys in any two of: Saka, Rashford, Grealish, Foden, Palmer, Gordon, Bowen etc. And Kane up top.
Whilst Rice may have some ability going forward, its not on a par with Bellingham plus, he's England's best No.6.
Pivot him with a box-to-box runner - Gallagher given the midfield call-ups Southgate has opted for, i'd have given Mainoo a chance - and there is a very nice balance there.