We talk about depth issues because we're acting as if OG is already out with injury. He's hypothetically the most healthy he has been in years, now that he had that nagging elbow issue taken care of, with several months to rehab his hamstring and get himself into peak condition.
PLUS... the idea of him sitting out as a contract negotiation ploy is a thing of the past now that's slated to be a 1/4 billionaire.
If anything, the move to get Bridges was the key depth contingency plan for OG's healthy.
Pre-KAT trade, I thought that there'd be very little difference between a healthy Knicks team 1) with just DiVo vs 2) with DiVo AND Bridges. You'd have more talent to deploy, but you'd have a bit of a logjam effect similar to last season where almost all of our wings were underperforming to start the year. (The addition of DiVincenzo probably hurt Grimes' trade value A LOT, after he was starting to look like a legit NBA starting SG to finish off 2022-2023 and drew trade interest during that off-season)
In the end, Bridges can do a lot of what OG can do (albeit defend bigs less effectively, but quick guards more effectively). Both in the lineup makes us terrifying, one in the line
Trading DiVo away opens up healthier minutes for our rotation players, with or without a healthy OG.
(on another note, Josh Hart was already a direct sub, better in some ways, compared to the version of RJ that was a Knick. RJ on the Raptors is hella confident, finds his spots, and shoots/finishes/rebounds/passes like a superstar)