Because Lewis is not twice as good as Mainoo.
Do you think he is.
Mainoo played OK in the euros and has been one of the better rags players, even though he is young.
Dunno about twice as good, but I think that Lewis is better too.
No idea how.good Mainoo is. He might be really good, but he hasn't played in any kind of proper system that seems him get more than about 40 touches per match. He's not shown any kind of control of matches, though he has got decent footwork.
Lewis has shown he can play in the best side in the country. Levels.