Would it be fair to compare him to Lucas' early days here?
In the season Lucas turned 23 he played the following games for LFC:
5 x 90 mins in the Champions League - ie. every minute of every game
6 x 90 mins + 1 x 120 mins in the Europa League - 7 x starting 11, and 1 sub appearance
Started 32/38 Premier league games and was substituted in 3times - 35 league appearance
2 x complete FA Cup matches, - 1 x 90 min, 1 x 120 min
In total Lucas played 50 times in the season he was 23, and he wasn't 23 until the January. He also played for the Brazil national team, as he has at every level.
It would be fair to say that there is nothing similar between Lucas's game time when he was 23 and Kevin Stewart, who has had 16 minutes of premier league game time this season, has never played Europa league, or Champions League, and hasn't played for England at any level.