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.
I'm looking at Gonzaga's draft history and they haven't had a G drafted since 2004.
http://basketball.realgm.com/ncaa/conferences/West-Coast-Conference/11/Gonzaga/332/nba-draft