WK...
You are not one of "those guys" are you that seem to get their panty's all bunched up because your FO uses a little highlighter on the Master OFP. Oh dear... god forbid!!
Seriously, who really cares. Just sign the darn thing and be grateful he at least takes an interest in highlighting what he feels relevant. I'd rather an FO do that then a guy who leaves everything empty and hasn't a clue what's important nor what to look at.
There are so many more things to worry about in the daily grind of our operation and you chose to bring up highlighters??? WTF!!