One of the new available features in BBS mod, but not in Blockbuster mod, is anchor keyframes. What it does is allows you to animate to which objects would replay would stick. This makes it possible not only attaching actors to other actors, but also animate the transition from the ground to an actor, or even between two actors!
Links:
— BBS mod's CurseForge page: https://www.curseforge.com/minecraft/...
— BBS mod's Modrinth page: https://modrinth.com/mod/bbs-mod/
— Patreon: / mchorse
— Boosty: https://boosty.to/mchorse
— Afdian: https://afdian.com/a/McHorse
00:00 — Intro
00:20 — Basic demonstration
01:06 — Picking up and dropping off
06:05 — Handing an object from one actor to another
09:48 — Handing a sword from one actor to another
14:22 — Outro