Warriors need a big, and Allen is a great one. They also need to solve their Kuminga problem.
Kings want Kuminga and have offered Monk and a lottery-protected first -> make that a top 10-protected and its done
Cavs want to let Mobley play the 5. On the other hand, they want to replace Ty Jerome. Monk is a great bench guard, making him the perfect Jerome replacement. They get TJD, who is good for big depth. Lastly, they land many good picks to push them to go for this trade.