Good to see you again, DTS.
Plenty have teams have drafted 5 players in a draft, using a loose definition of "NHL player": NYI in 2008, OTT in 2011, CBJ in 2002, Florida in 2011, LAK in 2009, Chicago in 2003, WSH in 2004 .... This is just some recent examples. I don't know why "first 5 picks" matters and Benning had two first-rounders in that draft anyway which obviously increases the odds.
Given that it was his first draft, and that Benning swiftly traded two of those players (and hasn't traded a single drafted player since,) tells you that he wasn't too enamored with those selections anyway.
I've posted the numbers in terms of nhl player vs expected players given where the Canucks have picked, and it's pretty much exactly average overall.