TMZ Sports caught up with B. Diddy just days after Rivers claimed it would be bad if King James' team drafted the USC standout ... which was met with heavy criticism from the "All the Smoke" podcast host, who referred to the former Clipper as "trash."

Davis -- who played 15 seasons in the NBA -- weighed in on the debate while out in Vegas for the Super Bowl festivities ... and he's optimistic about the potential pairing.

"Your daddy is LeBron James," Davis said, "I think it will do nothing but help him."

"You say it'll enable him because your daddy on the team, but like, nah, that s*** different. That's LeBron. LeBron's a coach, a basketball genius and that's his seed."

Davis used Ken Griffey Jr. as an example ... as the former MLB legend played with his dad on the Mariners in the 90s -- making them the first father/son duo to play on the same Major League Baseball team together.

"There's a certain type of swag, there's a certain type of s*** that you really didn't get to see as a kid," Davis said.

"Now you there, you get to see your dad's whole layout."

At the end of the day, Davis feels Rivers' own comparison to being coached by his dad is totally different than Bronny playing with his pops ... and the James duo will benefit whichever franchise they play on.

"[Bronny] already got the DNA. Now you got the whole layout, the whole trajectory, and the blueprint laid out for you."