Well it’s the old Gerrard/Lampard thing. I am far from an expert, but I managed to figure out that if two world class central midfielders can’t play together then at least one of them* isn’t world class.
There is some onus on the coach to set out and police what the players should be doing, obviously. Fabio Capello must have been tuned it to what was wrong with those two so maybe he was only ever phoning it in and didn’t care for the fuss that would come of dropping one of them**. Southgate, perhaps, doesn’t have a better idea than picking the shiniest 11 and hoping it clicks. He’s a follower, not a leader.
* Gerrard, obviously
** Gerrard, obviously