Maker reminds me of Myles Turner.
Except that Turner can really shoot. Turner is the one who comps to a taller/longer Andray Blatche, imo. Maker has a long way to go, and I worry about his quickness and coordination. Remember how talented Derrick Favors looked offensively when he was 18 and 19, playing against inferior athletes? Maker looks similar at this stage, but you have to see him in an NBA setting.
A lot will depend on Maker's mental toughness and work to make up for mediocre feel for the game. He can, however, be a significant defensive presence once he gets stronger (e.g., Hassan Whiteside).
Reminder of what Derrick Favors looked like at a similar age... ( Oh, and that's the other thing---do we know Maker is really telling the truth about is age? )
https://www.youtube.com/watch?v=99Od-U5IF4s