i will be brutal here - so what if you have even 2800 on class/spec X - you can play really really bad in class Y.
why should someone who doesnt know you risk his precious key ?
want to get into kesy easy ? bring your main not your alt.
also +15 is literaly hardest key to get into besides +20 - why ? because thats where all 2400-2800 people go to fill their GV slots . so you are competing with 1275631256361253 people who have 250+ itlv and much higher score.
play 16-17 - its so much easier to get into those then into 15.
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usualy by checking how many +15 runs he has. if he has like 100 + timed dungeons in that bracket by now on that char he is usually qualified for weekly +15 spam even if he just did 15s not a single 16.
and since i seen people who are now closing on 150+ timed +20s i dont think that it exageration to demand at least 100 + if you want to hard spam +15 for vault.
+50 timed +15s is like bare minimum at this point. someone who has like 10 timed dungeons ? hard pass for weekly in groups filled by 230o-2500 players.
and no its not harsh or elitest - if you want to speed run or progress/push you gotta uphld standards. one of cardinal rule for pushing is to check every single person in team not just if lead is 2300. because a lot of 2400 people are boosting their buddies atm
i kinda wish though that there woudl be additional data aviable - like total score on all chars, then data divided by number of chars then number of timed +15s and +20 on whole account. this would be very very handy when putting good groups.