It's more what we lose in the middle of the park that's a concern for me.
I share the same concern though. Henderson's contribution in the middle of the park is invaluable. Genuinely hope we still sign a CB this window so we can move him/Fabinho back to the middle for the majority of games.
In isolation though, he has been very decent as a CB and doesn't have the tendency to dive in compared to Fabinho who gave away the foul against Cavani in the cup.