Randy,
I agree. In fact, I think the perfect offensive assistant coach is out there in the form of John MacLeod, who used to coach high-octane Phoenix and Dallas teams. MacLeod's schemes are extremely big on floor balance (which is probably why he's not had a head coaching job in years, considering isolation offense is all the rage now), which would leave the players in the right positions for Van Gundy's defensive schemes.
Seems like a match made in heaven, to me.