I guess the Lakers really want to impede Zubac's development
Bogut speaks Croatian and plays the same position. His signing with the Lakers sounds more like a nice weather/no playoffs/new opportunities direction in his career.
I actually believe that he will help Zubac become a better pro, and not take too much playing time from him. Bogut will log about 600 season minutes this year IMO. Zubac logged 600+ last year.
there are approximately 4000 (3936 + some OT's) total regular season minutes at center:
Lopez - 2250 mins (75x 30 min)
Bogut - 600 (40x 15 min)
It leaves some 1150 of the remaining minutes for Zubac or others (small ball ideas).
More than enough.
But TBH Zubac is not some unique amazing basketball talent. He is good, but not great and he will get his chances. Even more in the case, that he proves he is a starting caliber material.