Lyn IVs // orb algorithm?

hi so i ended up with a pity breaker lyn (RIP 11%) and decided to summon the full circle and ended up with 2. from the 2 sets of IVs, do i got +Spd/-Atk or +Res/-Def? i'm gonna run the basic swift sparrow build unless someone convinces me otherwise.

so i was just wondering if the game has an algorithm to what color orbs appear during summoning sessions? idk if anyone else gets this or if its just coincidence but during the legendary banner, i've been summoning exclusively on colorless and every time im down to my last 5 orbs, i'm either faced with no colorless orbs or multiple colorless orbs. it has never been a single colorless orb.

i've had this situation with multiple other banners before so i'm wondering if the experience is universal. maybe the game keeps track of what colors you summon the most during the banner so it can tell if you're sniping for a certain unit and in a last minute attempt to make an orb sale, it gives you none or a lot of the color you were searching for???