Lingard and Alli on the same level fml, Alli had a return of 18 goals and 7 assists last season. That put him 6th in overall goals for the season. Above the likes of Hazard, Ibra, Coutinho, Mane, Giroud. His return of 7 assists was on par with, or better than Coutinho, Silva and just below the contributions of players like Ozil, Sanchez. For a 19-20 year old, playing what? His second or 3rd season in the EPL? Those stats are phenomenal for established players at the peak of their game, let alone some 19-20 yr old kid.
Yes he is going to have consistency issues, much like his team mate Eriksen did early on. Or any young player for that matter. This kid could very well go on to be the real deal, the next 100mil player, maybe to RM or PSG.
This is not to slate Lingard, but Alli has been rated as the best young prospect in Europe on occasion.