Bears of the Pleistocene

[Artos]

I read that in the Pleistocene, the cave bear limited the distribution of the brown bear, and that it became widespread after the cave bear became extinct. This is true?
After all, the Pleistocene steppe brown bear was even larger than the cave bear + they have different niches. The steppe bear was more predatory than the modern brown bear, which in turn is more predatory than the almost completely herbivorous cave bear. So they have different niches. How could a cave bear "keep out" a brown one?
In addition to the huge U. a. priscus in the Late Pleistocene was inhabited by almost the same huge U. a. kamiensis. About the first they write that the average weight was from 700 to 1000 kg. Is this true or an exaggeration? If so, this is the average weight of the arctodus, and is more than the polar bear, the kodiak bear, and the cave bear, whose average weight was about 500 kg. Reply