Roster construction is more important than ever in today's NBA. Both because the new cap rules severely punish teams and because never in NBA history has creating space and defending space been more important than it is today.
The idea that the Kings can just take on a bunch of salary to add guys that don't neatly fit with the overarching concepts on offense and defense is ludicrous. Randle would negatively impact spacing, make a poor defense worse, and not fit within the flow of what the Kings are trying to do. What exactly does he do that would elevate this Kings team?
hrdboild is right - this shouldn't be about finding a discount "star" regardless of fit - it should be about carefully adding pieces that improve the overall team. Enough depth to weather a long regular season, but really focused on the ideal 8 or 9 man rotation for the post season.
The four building blocks are Fox, Domas, Murray, and Monk. So what do you need around them? I'd argue that you want two 3&D players in the starting lineup, a scoring wing and/or big off the bench to help Monk in the second unit, and a high level backup center, ideally one that can swing between the 4/5.
If Keon is your starting SG, then you need a 3&D guy at either the PF spot (ideally adding some rim protection/weakside shot blocking) or a rangy defensive SF, ideally with some secondary playmaking and who can create shots for himself.
It starts to become quite a wishlist, and you won't get everything you want, but you start with the bigger deals you can make and then you fill in the gaps.
Who's the ideal starting PF for this team? I"ve argued that it's a healthy Jonathan Isaac. If you can swing a trade to get him, then you need to add some bench scoring and floor spacing. Maybe in certain matchups that Lyles as a small ball 5 and Vezenkov at the 4 as a five out 2nd unit. Or maybe additional trades are needed.
If you can't pry Isaac from Orlando (and I've become resigned to that being unlikely) then maybe you do take a flyer on Kuzma. Maybe for Huerter and Davion and next year's 2nd rounder from Portland. Not a perfect fit, but it's something. Now you have plenty of scoring in the starting lineup. So maybe you give Portland some cap relief and trade for two guys that don't have a future with the Trailblazers by sending Barnes and Duarte for Thybulle and Robert Williams. Use #13 for a bit of bench scoring (Da Silva?) or an upside swing (Holland?) and see what that mix gets you.
Point being, roster construction is hugely important. Each move needs to be calculated to mesh with the overall goals of the team. And in my mind, guys like Randle or LaVine (ESPECIALLY with Monk back) don't do that.