I think his trajectory would nearly be identical to Gibson's. Two years of college/junior - turn pro in your 3rd year post draft - make the team or not, but AHL likely for most of that year, so bottom line my estimation would put Knight 3 years away from this season before we would see him as a legit possibility for our team...if you view him as a superstar, you easily wait for that as most of the "regular" top picks are at least 2-3 years out as well.
I am just saying 3 years to get here, not be a starter/whatever.. I would have a hard time passing on him if you think he is equal to Gibson as there is no reason to think he will differ much from John Gibson's path to the NHL.
if you can package our 2nd with Forsling/Sikura/whatever and move up into maybe 29-31 range, and he is still there Hawks should seriously consider it.