I haven't seen this suggested yet, so I thought I'd give it a go.

The amount of EXP and Stats given to a lioness after a hunt appear in our user logs. For patrolling submales however, we are only given information on whether or not they brought back an item. I suggest that like hunting lionesses, submale stats gained from a patrol are listed in user logs. Keeping track of how you gained certain stats can be quite difficult without the log the check against.