As others have said, jury is still out. For 20m, I'd expect a regular contribution to goals/assists from a winger.
However Dango is young and should improve, especially under AI. He's had some champagne moments and he's produced some absolutely shocking performances (think Everton away) but that's not unusual for a 21 year old.
The left back thing is a bonus for sure, if he can fill in there when required then he's saved us 5-10m already.
With everyone fit, will he get the games needed to develop? I don't think 20 or 30 minutes here or there will be sufficient.