1day in and notice what looks like a bruise on fat cap. Is meat ok to age?

[Ron Pratt]

That bruise as you call it is merely some discoloration from the fat cap’s reaction to the hemoglobin that was in the cryovac packaging. Human bruising like you are comparing it to is blood which reached the skin as a result of injury. Bruising is not on the fat cap of bovine.
Ron