Sorry, but you're assuming facts not in evidence. With the growth of the players around them, he plus Bogs plus Fox have an almost unlimited potential. Want to see what he's really capable of? Put him out there with Giles and if that works, BONANZA!!!
Hang on, aren't you doing exactly the same in the very next sentence?
What makes you certain that WCS will continue to grow?! You are assuming that he will but there is no facts that guarantee that he will!
If we really want to deal with facts then here is some
He is in his 3rd year averaging 12 ppg / 7 rpg / 1 spg and not even 1 bpg in 27 mpg
Here are some facts based purely on his production this season and nothing else.
He is NOT a good rebounder
He is NOT a #1 scoring option on a good team. Hell he is not one on a bad team like the Kings this season.
To be a number #1 option on a perennial play off team (read not a contender) you need to be as good as one of these guys i.e. WC standings at the moment):
Golden State - Curry/Durant
Rockets - Harden
San Antonio - Aldridge (Leonard when healthy)
Minnesota - Butler (or KAT)
OKC - Westbrook (even George for that matter)
Denver - Jokic???
Portland - Lillard (or even McCollum)
New Orleans - Davis and when healthy Cousins
Now I know that purple coloured glasses can be strong around here but please! No one in their right mind would put Willie in tha same ball park as any of those players!
And just to compare apples with apples, all of those players have been more productive players in their 3rd season than Willie has been even though he is having a breakout season. Hell most of those players were better by their 2nd season in the league and majority of them entered the league younger than WCS did.
WCS is a very good player and can be a very good starter on a perennial play off team in a certain role. Being #1 big is certainly not that role based on his production to date and comparisons to others in that position.