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David Griffin said that having Zion Williamson start quarters instead of finish them is part of the organization's plan. 

The team drew criticism after Williamson sat out the final 7:19 of the fourth quarter during their loss against the Jazz.

"The reason they are taking place as they are at the beginning is just that the medical team wants to make sure he's warm and loose before he gets on the court ... His routine is to get loose at a certain time. We don't want him to get loose and then sit on the side and wait, because that's not conducive to him playing his best," said Griffin.

Williamson was limited to 15 minutes in the game.

Griffin added that Williamson wouldn't play "significant minutes" against the Clippers on Saturday.

"I realize that it's really detrimental to doing what we're attempting to do, which is make the playoffs, but if we're going to have him at full strength coming through these games, he's got to go through this process," added Griffin. 

Via Andrew Lopez/ESPN

Man he had all those months off and hes still not ready to play ?

Whats up with all the reports about Williamson in peak or amazing shape before the restart and now he cant even play more than 15min a game? How many more months of conditioning does he need before he can do the job that he is paid to?

https://nba.nbcsports.com/2020/07/02/zion-williamson-looks-in-incredible-shape-says-hes-focused-for-restart/

https://www.wdsu.com/article/zion-williamson-in-amazing-shape-as-the-pelicans-prepare-for-the-season-to-restart/33099155

I have not been following basketball, but why is he on a minute restriction? Wasn't he playing 30 min a game right before the lockdown?

It's insane that a professional athlete sitting down for a period of time suddenly can't play because he's not warm and loose at the right time.
"We don't want him to get loose and then sit on the side and wait." - That's literally what he is doing!