I've followed his progress for a number of years and think his potential is as good as Sancho's. I can't see a flaw in his game as an inside forward/winger. I was saying this since he replaced Gomes at the u17 Euros a couple of years ago, he played as a 10 in that tournament and showed great ability in that position too.
I think his senior appearances have been very encouraging, especially in his 90 minute games He has played 5 games and has 3 goals and 3 assists, he's been Chelsea's best player in at least 2 of those games. Two of the assists were great crosses against Forest and he shows the ability to dribble players, pass creatively, finish and leave players in the dust with pace.
OK, this has been against lower level opposition but he has been playing mostly on the right which a weaker position for him than on the left.
If he keeps his head screwed on, he is supposed to be a very professional and nice lad, I think he's a good a bet as any to make a real mark on the game.
https://www.whoscored.com/Players/350088/Show/Callum-Hudson-Odoi