I think they should dedicate a certain time period for the shop or a separate tab in the shop to display buddy's from previous bundles to purchase. I'm always picking up weapons from the enemy and I see all these awesome buddies and it saddens me a little thinking "they're probably never going to add this back". I get it if they never add back buddies from previous battle passes because people were meant to grind for them during that period of time and it would be unfair to those who grinded for them, but I think it's about time for buddies from other bundles to come out in the shop. IMO it would be a win win for the consumer and riot.