Junior production is nice, but it should be used as a confirmation of actual talent (size, speed, IQ, etc) and not as valuable in and of itself.
The reason good numbers at 18 matter is they more likely reflect talent rather than physical maturity and experience, so they're a better indication of potential than overage production (see Weal, Martel, etc.).
Zamula is a great find, but nothing suggests he's in the same league with Myers or Sanheim as a prospect.
In fact, we'll see in a couple years if he's better than say Wylie.
It probably depends on the impact that physical maturity has on his game, does he get stronger and faster or bigger and slower?
Morin probably has more upside than Hagg, but the two are more alike than some want to admit, Morin needs to be paired with a puck moving defenseman because he can be pressured into coughing up the puck, and his mediocre lateral agility will require that he "play it safe" or good skaters will leave him in the dust (much like a CB who has stiff hips). But his size, strength and reach are pretty rare.