I once got drunk with Dave Kitson and Hermann Hreiðarsson in Iceland, I mention this as proof that I know my football before stating my opinion.
Doucouré is by no means a perfect player, but he gives a drive and presence to our midfield that we’ve been missing for several years. Assuming we one day get a sitting DM then he’ll be the most attacking of our midfield three, so it’s no surprise that he has defensive lapses.
He’ll be given plenty of time by our fans, because even when he does make mistakes there’s no question about his workrate, and after years of seeing players who are arguably more talented stroll around the pitch at 50% effort it’s a welcome change.
Maybe it’s as another poster mentioned earlier and Allan/Doucouré were brought in for their mentality as well as ability.