i think Seljaas, Hardnett, and new PNR/half court system will make BYU offense better, but defense could suffer.
If asked to guess right now, i'd speculate a jump from #87 to #25 offensive adjusted PPP and a drop from #87 to #100 defensive adjusted PPP per Pomeroy.
One thing that BYU did very well primarily because of Nashif is the out of bounds play under the hoop. Does that loss cause a hit to the offensive effectiveness? We should be able to keep most of it for a year at least from institutional memory.