On the primacy of exposure

Not much really unless the exposure has forced a shutter speed or aperture (soft wide open maybe) that makes the image soft...as appears to be the case here.

No they are very soft as presented as areas sharp in one pic are soft in another even at the center so I was wondering why.  The 6 pics very greatly so maybe that's why exposure does have a big impact (important to get it right) as it might result in changes in aperture and shutter speed far from optimal when under or overexposed. The loss in detail in the highlights is the thing I most notice.