Zags isn't a blue blood and won't be imo. Their coach is excellent but their small conference affiliation and small school in the NW location won't allow for the exposure. They are extremely lucky that Few has stayed and rejected more prestigious jobs to build their name. Actually much like WSU going to AAC this would be the time to jump up a conference (MWC?) to continue their rise it is capped now. Let's remember they had one loss and a lot of experts wanted them dropped from a 1 seed due to their weak schedule.
The Zags are a very respectable team and totally understand Elijah going to play for Few. I'd still argue that if he wants to best enhance his pro prospects ISU is a better fit. Much easier to get scouts to evaluate your game playing against KU/OU/WV's rather than St.Mary's/Pacific/SFU. Also an underrated selling point is Prohm's development of PG and getting them into the NBA. Few doesn't have that track record.
LOTS of talent in the NBA from Gonzaga. If your talented, you will be scouted by the NBA regardless of what team you play or who your competition is. Zags play plenty of high major teams so film is there. PLUS - when you put as many pros in the league as the Zags have, no chance a kid gets passed over by the NBA playing in eastern WA.
ISU doesn't give any kid more chances to play pro than does Gonzaga. None.