Don't understand Zion not playing back-to-backs

I've heard it said over and over, "Zion stays in shape by playing basketball."

Ingram is playing tonight in Utah and he's three years older than Zion.

Just don't get it...
I agree. Gets paid far too much to miss so many games. Also a young player still. I understand he hasn’t made it through a full season yet so I get having veteran rest days but this seems a bit much.