This trade actually makes sense for both teams. The only way to beat the Heat is with dominant bigs. Howard and KG down low could get that done.
For the Lakers,they get an all-star PG who Kobe loves. As Kobe ages, Rondo can get him easy shots and scoring chances and Rondo can be their franchise cornerstone going forward. If the second player was Jeff Green this would be even better for the Lakers as it gives them another shooter to spread the floor to run D'Antoni's system.
The fact that everyone is denying this so strongly makes it seem even more legitimate.