Klay Thompson was drafted a year older than McLemore was when he was drafted, and it's also worth noting that McLemore is playing on a team that already has two alpha dog scorers. Thompson walked on to a team that was asking him to score right away. As LarBrd suggests, if McLemore was asked to shoot 15 shots a game, it's likely he'd be putting up similar numbers.
In Terrence Ross' second season he averaged 11 ppg on 42/39.5/84% shooting.
Bradley Beal is the only player you have a real argument with, and still, the shot attempt excuse applies.
If Keith Bogans was ever a 21 year old scoring 10 points a game on 45% shooting from the field and 41% shooting from behind the arc on a winning team, then yes, McLemore is playing that role.
If Boogie and half a season of Gay count as 2 alpha dog scorers, what do Curry, Lee and half a season Monta count as?
If you go per 36, Ross has been at 14/15/15 in his 3 seasons. And he's on the lower end of the promising SG prospect roster. B-Mac is at 11, same as last year (just more efficient).
Just look at Bogans per 36 stats for his career. That's the kind of role McLemore is playing. He could always break out into a higher usage role, but the point I'm making is that he hasn't. And it's not like all similar prospects play the Bogans role when they are starting out, as the examples of Thompson, Beal and to a lesser extent Ross attest.
You bring up some good points. One gripe:
Let's look at Thompson pre-Ellis trade vs. post-Ellis trade. Ellis was traded on March 13th. Keep in mind this was the lockout season. In the months of December, January and February, Thompson's usage rate was 15.5, 21.5 and 21.7 respectively. In the months of March and April, his usage rate jumped up to 27.5 and 26.1, respectively. Similarly, in the months of December, January and February, Thompson's ppg was 3.0, 7.7, and 8.1. In March and April, his ppg skyrocketed up to 16.4 and 18.1, respectively.
Part of this differential can be attributed to a rookie learning curve. We saw Kelly Olynyk go from an end-of-the-bench guy to one of our most reliable shooters all in the course of a season. Part of it can be attributed to the fact that he had a star playing directly in front of him. However, it cannot be ignored that part of this must be attributed to the fact that he was playing with a star in general. I don't think it's ridiculous to say that if Ellis remained on the team, Thompson's emergence as a star would've taken a little bit longer.
I also have to point out that I was largely referring to McLemore's second, current season alone. We can all admit that McLemore had an extremely disappointing rookie season, and so I was comparing his sophomore numbers with the sophomore season numbers of the other guards mentioned. Thus, I viewed the DMC/Gay duo to be more "alpha" than the Curry/Lee duo. Part of this assumption has to do with my perception of Lee being a guy who scores a lot off of second chance opportunities and put-backs (as well as being the worst player out of DMC, Gay, Curry and himself). I will concede the small sample size, but not surprisingly, the combined usage rate of DMC and Gay so far this year (60.3%) trumps the highest combined usage rate on the 2012-13 Warriors squad (Lee/Curry, 49.6%) by almost 11 percentage points. This, to me, is the reason why McLemore is not getting a greater share of shots despite shooting efficiently.
Interestingly enough, Thompson's sophomore year usage rate actually decreased to 21.8 from 24.7. My guess is this has to do with adjusting to life without Ellis and life with Bogut. Curry's usage rate jumped from 24.0 in Thompson's rookie year (2011-12) to 26.4 his sophomore year (2012-13). Also, in 2011-12, GSW's two most highly used centers pre-Bogut, Andris Biedrins and Ekpe Udoh, had a combined usage rate of 18.9. In 2012-13, Bogut alone had a usage rate of 13.4.
Out of all this, my point is basically that McLemore is showing tons of promise right now and I believe he is ready to take the next step in becoming a star: shouldering more responsibility.