Ajit Raj Prathi

I recently came across a well known DP's story on Instagram in which it was seen two cameras were stacked on top of each other. It was noticable that both the cameras had different magnifications (different lenses). I can't help but wonder why he might have done this given that these cams shoot 4k/6k or so, he might as well have just cropped in as required. Would be great if someone with experience could explain why this is done. I have attached a screenshot for reference.