Why would Lakers do this?

The Lakers are in need of a good Defender. Eason fits that really well an has still a high upside comming of a injury. Clint Capela is a way better 2. big that Hayes. New Laters Team:

Starting 5: Luka | Reaves | Lebron | Eason | Ayton

Bench: Smart | Vincent | Konchar/Thiero | LaRavia | Capela

Why would Rockets do this?

After the FVV Injury the Rockets still need a PG. Ty Jerome could really help them as a starting PG and show, what he did last season with the Cavs. + extra 1. Rounder and 2. Rounder this year. New Rockets Team:

Starting 5: Jerome | Thomson | Durant | Jabari | Sengün

Bench: Sheppard | Okogie | Tate | Finney Smith | Adams

Or: Sheppard | Okogie | Finney Smith | Hayes | Adams

Why would Grizzlies do this?

the Grizzlies get have too many guards an a young Wing + Hachimura is helping and build for the future.

Starting 5: Ja | Coward | Hachimura | JJJ | Edey

Bench: Pippin Jr. | Wells | Knecht | Aldama | Clarke