With Dylan, I think the correct statement would be that he did not TAKE a ton of 3s in his high school career, and therefore did not MAKE many. He can get to the tin at will, so there was no need for him to have been a high volume 3-pt shooter. But if you watch his form, he LOOKS like he will be a good 3-pt shooter.
As for Dylan and Ace's 3-pt shooting percentage/volume, I agree that if they both have good percentages, our offensive efficiency will skyrocket. But the great thing about this year's team is that they don't have to be the PRIMARY 3-pt shooters. Martini and Hayes will be the volume 3-pt shooters, with some Acuff mixed in. So if Ace and Dylan can just get north of 30%, our offense will still be very good assuming Martini and Hayes are pushing 40% and Acuff is hitting 35% or better. And if Ace & Dylan can get to 35%, holy schneikies Batman, this offense is going to be ridiculous when you combine that with the basic penetration and "shot-making" abilities of Ace, Dylan, and JWill (who is money in the paint).
Finally, re: Dylan being the primary PG, even if that's the case, it doesn't mean he will need to GUARD the opposing team's PG. In fact, at 6-6 or 6-7, I'd venture to guess that Dylan will NOT guard the PG. Rather, in the starting lineup, we're probably going to see JWill guard the PG and Dylan will guard the SG.