Yes, really. If he is nothing but an excellent off-screen/spot-up shooter he will be vastly more useful to the Kings offense than Kuzma.
Kuzma has a career TS% of .545, and he's never once had a season where he recorded .550 - and for that he's accustomed to getting almost a 24% usage rate (never under 20%)! For reference, the Kings' offense last year for the TEAM had a TS% of .608, and no rotation player was under .545. Outside of Davion, the closest rotation player was Monk at .587. Davion was exactly at .545, and we all know how we felt about Davion's offense. Kyle Kuzma is Davion on offense, except he takes almost twice as many shots. Yes, let's sink our offense with that guy.
Kuzma's defensive numbers are fine, but they're not that special. So if you're going to give out something like 4/$80M to a guy who has proven over six years to be not-at-all-good on offense, and whose defensive numbers don't scream superstar, then there better be something that we don't know.
I'll take the shooter at a third of the price. I know how to fit him into the offense, and I'm damn sure I want him taking more shots than good ol' Five-Forty-Five.