When people talk about the viability of players, one question is always raised: “Is [fill in the blank] capable of being the [fill in the role] on a championship team?”

Nobody states as a fact that Mitchell or Tatum were those guys before their playoff performances.

When Kuzma was playing at such a high level during the first three months of the season, the rest of the Lakers starters were shooting like crap from beyond the arc:

October: Lopez (.269), KCP (.304), Lonzo (.286), Ingram (.333), Clarkson (.385), Hart (.333)

November: Lopez (.318), KCP (.367), Lonzo (.243), Ingram (.333), Clarkson (.366), Hart (.182)

December: Lopez (.286), KCP (..290), Lonzo (.377), Ingram (.316), Clarkson (.317), Hart (.419)

Kuzma become a focal point of opposing coaches very quickly, but still performed brilliantly.

I think the context of the Lakers’ poor season is being held against Kuzma, more than any real data that substantiates your opinion.