At some point that can't be an excuse anymore. Miles said last night in the press conference that he is averaging identical numbers as last year. That's not good. His build is the only thing that has improved thus far and that hasn't even translated into anything.
Being a true sophomore isn't an excuse. It's a fact.
Research has proven with statistical certainty that seniors on average are better than juniors who, on average, are better than sophomores who are better than freshmen.
The rate of improvement diminishes as a player gets older. But it is a fact that sophomores are, by definition, less experienced than juniors and seniors.
In a way, you're right, though. When he's a senior, we'll no longer be saying that he's only a sophomore.
If you're so in to statistics, look at Tai's stats. Same as last year. So where's the improvement? He's no better than last year. Might want to double check whatever research you were referring to.