These are essentially two separate trades.

Lonzo for Fournier - the Bulls move on from Lonzo and free up salary at the end of the year. The Knicks receive a potential backup point guard with a small chance of providing some solid minutes next year. More importantly, Lonzo's contract would be useful if a star like Donovan Mitchell becomes available.

Bridges for RJ & 5 picks - winning an NCAA championship is extremely difficult. The Villanova cast of Bridges, Brunson, Hart & Divencenzo did it twice in three seasons. They have great chemistry and skillsets that complement each other. Bridges provides the additional tier of defense and the off ball movement that RJ still lacks.