Januzaj has a surprising burst of pace to start, but usually defenders catch up as he isn't that fast on full sprint. He just hasn't been using it apart from Swansea. He's been playing more of a patient role, waiting for players to make a run or slip in between defenders. He can still beat defenders if he tries due to that burst of pace, skill, and balance. He can find players with his passing, they just need to start slipping in between the defenders if they decide to double team Adnan and they need to make runs.
He had a great pass to Shaw in the 11th minute that would have created a goal scoring opportunity if Ivanovic didn't barely manage to get a touch on it.
Excuse the bad quality
Like I have said in the past, this game was more reminiscent of his time when he first came up for the u21s (which I prefer) than when he started to really emphasize dribbling at the start of the u21 season in 2013/14. He used to beat teams with his passing, not his dribbling. Cole, Lingard, Vermijl, etc... had more of an understanding with his playstyle though. He always had dribbling in his locker, but he never tried beating players all the time. Even if you take a look at solely his u21 performances you can see there is a big difference to his playing style for the u21s this season compared to 2013. How many times did he try to beat the Spurs u21 defenders compared to his match in the u21 finals vs Spurs in 2013? It's night and day difference.
Not sure if the other regulars of United youth team football will agree with me, but that's how I have seen him.