One of the biggest points of emphasis for me on this forum, over decades, has been the mental and chemistry part of the game, so this isn't some unaccounted for variable. The problem becomes the application. I feel like I was pretty far ahead of the curve on having an extreme distaste for McGrady, Dwight, or Carmelo. Not a general distaste but more the idea that there are certain profiles of guys who don't cause you to win, despite their unbelievable talent. In the height of all three of those guys (there are more), people would be swallowed up in how overwhelming the talent is. None of these guys are necessarily "toxic" in the sense that they create a rift in the locker room or that everyone hates them. The fundamental issue becomes the type of psychological makeup that your roster becomes. When you have those guys as the key 1-2 or even 3 cogs, the dynamics become problematic. Eventually the league soured on each of these guys, but failed to account for changing dynamics to realize that the application of this principle changes as the dynamics of team leadership and role change. Each of these guys then moved into much different roles, where they're not the go-to guy and they're not looked up to as the leader of the team, but the reputation of being "not a winner" carries forward into what is now a totally different equation. Dwight floated around the league being drastically underpaid and underrecognized because people were still colored by him not being a winner in one particular scenario. Despite my strong dislike for him historically, once those dynamics changed, I would have loved having him backup Rudy. Likewise Carmelo. I may be hard pressed to not have Carmelo on my all-time starting five of most disliked players, but when everyone soured on him, the price was low and it was time to buy. He's a very flawed player and most certainly not the guy you want leading your team in any circumstance, but to come in as a role player? There are way more teams that should have had interest before Portland kept picking him up on the minimum. He's got more value than that. Likewise Rodman or Artest. Both of those guys can be huge distractions, but when you've got a strong dynamic already in play where this guys come in to fill a role, it's a different equation. Artest on Indiana or Sacramento as one of the main guys? Good luck. As a role player beside Phil, Kobe and Pau? Come on.
If you're wanting to feature Christian Wood as a big piece of your offense, or if you're a Houston with no leadership, yeah... good luck. But if you're an established team landing a guy for the minimum, you're not depending on this guy in that fashion and, despite whatever potential they have for being toxic, nobody on the team is acknowledging this person as being the core of the team, so the negatives can be much more easily absorbed. The chemistry issues are lethal when it's your Donovan Mitchells or Rudy Goberts. It's not nearly so significant when it's your Royce O'Neales or Rudy Gays.