A line in a reference

Adams attribute would be of enormous benefit to any organisation, were they to employ him.

Attributes when used in a general sense are usually plural. One attribute would be one specific attribute, and you would say what it is.
The second half is redundant. Only use it if he could be a benefit without being hired.
You need to say 'Adam's' because it's possessive, his attribute.
So that just leaves a short sentence, and out of context it says nothing about why he's an enormous benefit, and I'd tone down the word enormous.
I might say 'Adam's attributes of (organization, leadership, good communication, self-direction, multi-tasking, state a few) would be an asset to any organization, and I believe that his specific skills of(insert them here) would benefit your(small, large, manufacturing, non profit, retail, R&D, etc) company very much.'