How come you assumption is so accurate? It must be silencep's fake acc though, as Forcejke mentioned on his zotac stream that he got owned badly in 2v2 with lexaaa at T6 (almost lost) when playing against 'silencep and his buddy'.
the duel bar is still grey, so it means he didn't play enough matches to yet be considered anything in regard to tiers
edit: oh you're talking about CA
maybe he doesn't make enough points per game in CA, and he carefully chooses which team to join (to get a high win rate)
2nd edit: it's clear now
he probably plays rail only and on a "handicap"
so he can shoot 10s of impressives per game with a high accuracy, but without doing much dmg
whenever it gets close he'll turn down the "handicap" setting and win the round vs the tier 2 players on his own