This is a non-issue, and as implied, it is some weird compulsive behaviour (may not be the right word but I get the point) in thinking you need to reach 1500 dungeons with 1000 coms at the same time.
1. getting 1500 dungeons does not magically make you an expert.
2. getting 1000 coms does not magically make you an expert.
3. getting mentor status is not really a big achievement, if you think this, then they need way higher requirements.
4. I met a 270 gear all 3 tanks, 270 mch/brd and 262 drg, with 60 job level in EVERYTHING but fishing, and you think a person like this would have some basic understanding on some PvP concepts, but nope, complete dead-weight. I used as much as I could as a SCH and I STILL had to let them die or me, because of the tools SCH lacks, and the thing is they where whm, def could done more to save themselves.
In the end no amount of requirements is going to teach people how to be aware and have a true meaning to a mentor to others.