Hmm, have I not been paying close enough attention? I haven't seen much of this newfound chemistry you speak of, mind some clips? I know you got 'em ready to be fired up already :P
Tbh, it's more a continued distrust of Dejounte's ceiling as a player. He's gotten real good this season, no denying that, but I still see fundamental flaws that can and will get exploited in a playoff series. His dribbling skills are still nowhere near top-of-the-league (the user MannyIsGod, I don't know his exact handle but I'd @ him, replied to me in a thread i can't find now a couple days ago, asking how DJ could be schemed out of a game: attacking his handle and even a full-court press is the easiest, and sadly very realistic, option). His passing is still very basic, in that it gets the job done, but doesn't really justify his being a full-time PG when you also have White on the court, who's IMO a much-better decision maker, has better PnR chemistry/activity, has a better "feel" for when to attack and when to distribute (as opposed to DJ being exclusively a score-first PG most of the time, White can do both depending on necessity, and has the better court vision and passing instincts). Matter-of-factly, if Dejounte's 3pt shot were even league average (I don't care about % but willingness to shoot instead, and DJ's well below league-average there), and the Spurs weren't so dead-set in their ways, I'd say the pairing would have a higher ceiling with White at PG and Dejounte as a 3-level scoring SG.
So yeah, it's not really about the Dejounte-Poeltl chemistry and whether it's good or bad, but more about whether I see DJ as a long-term piece for the Spurs or not. Against popular opinion, I'd rather sell high on him now that IMO, he's getting close to his ceiling (he'd be worth at least two FRP if the Spurs could negotiate for ). I'm not saying White is a sure-fire long term piece either, but I can realistically see him fitting better with whatever team the Spurs would want to build moving forward.