Why for both:

Pels: Add a primary ball-handler to facilitate the offense. Keep BI in the process, so they can try DG, BI, Murphy, Zion together or flip BI for a big man.

Cavs: A bit unorthodox, but the Cavs add a guy that is probably a better fit with Mitchell as a volume shooter and an off-ball player. CJ is also from NE Ohio so he might be extra motivated to play at home. Herb give the Cavs an SF with length and a developing 3pt stroke. Herb, Mobley, and Allen can erase any defensive deficiencies that could arise with CJ/Mitchell. Cavs also get the picks to add young depth or use in trades.

++Cavs after:++

PG: McCollum, CPJ

SG: Mitchell, LeVert, Okoro, Merrill

SF: Jones, Strus

PF: Mobley, Wade

C: Allen

++Pelicans after:++

PG: Garland, Daniels, Alvarado

SG: Ingram, Hawkins

SF: Murphy, Marshall

PF: Zion, Robinson-Earl, Niang

C: ????, Nance

Both teams would have some front-court depth issues to address, but both would still have some other avenues to make additional moves