Stat checking tilts you
A lot of people use op.gg lolking or elophant to see who is tilting and who are the "carry lords," but damn seriously that shouldn't dictate who you gank for. I'm not even close to even being a jungler; I am COMPLETE garbage, but I still understand map pressure to SOME degree. You can abuse stats to see who is tilting and then camp him/her to death till disconnection. k but these things should be considered
-
Low elos should not really count for determining who is gonna carry. People pubstomp. A
main with a 5-0 match history..is nothing compared to someone that has a thousand games with 
with around a 65% win rate. (This does not say that the veigar and vayne main would be on the same team on the same game). -
Junglers often have to decide: Do I gank for the "carry lord" or try and babysit someone so they won't feed incredibly hard as they did recently. THESE CANNOT BE DETERMINED BY JUST WINS AND LOSSES. Let's say they have a
ADC on the opposing team but we have this juicy 
player who seems like the "gate opener" because of the match history. Even though the player is successful at Lulu, this does not MEAN just keep camping for that (midlane). I sure as hell do not want to deal with a fed 
on the enemy team. SLAY THEM -
"Play safe" is not always the best advice - Why would you not camp for the
main although she is maybe at a 52% win rate when you know most players start to become headless chickens with no kills after 15 minutes..She doesn't really benefit from playing safe unlike 
TLDR; Game knowledge > OP.GG
inb4 i get harassed by the jangle support bandwagon