Even if he hasn't won a tournament with OG, aleksi has a history of making less than ideal teams work. With Ence, they managed to end Astralis' nuke streak and win blast pro series Madrid, with a team that doesn't have some of the biggest fraggers in the game tbh. If you look at Ence after aleksib, or xseven and aerial in Havu nowadays, there's no arguing that aleksib's influence as an IGL was important. Even with OG, the first roster lacked firepower but they still managed to pull upsets and be threatening. With this new OG roster, they have managed to be a good contender in the top20.
I think saying that Aleksi didn't show anything is definitely wrong, he has a place among top IGLs, not top1, but he's in the top for sure