One thing to note is that Banega has one of the highest ranges of perfomance in the modern game. One game, like always against us, amazing tackling, intilligent passing and sublime dribbling. But other games, like against Spartak he is completely useles and is a total passenger who has no heart in the game. Very few players go from 2/10 to 10/10 quite like Banega. All teams, inculuding Barcelona and Real in the past, will have trouble dealing with him not knowing what they will get.
With that said, Henderson in his prime seemed to rely on his physical engine more than others, like a midfield Bale. Injuries and endless pressing with Klopp seemed to have taken their toll on his physicality earlier than most. His postioning can't make up for his lack of physcality. And his overall game suffers tremendously so a Banega can exploit even further.
Shame really, it's why a lot want TAA to be pushed into midfield alongside Keita, to make up for not just make up for Can deperature but Henderson's rapid decline phsyical decline. He still has god games, but unless he adjusts, it is only going to get worse.