It was the second it happened. Haliburton's preference was irrelevant and the only logical explanation was that, give how they operate, Murray and White weren't going anywhere for a while. That not being the case, there's no excuse especially considering he's clearly Spurs material.
No, it isn't and Haliburton, 2 seasons in, is still almost 2 years younger than Brogdon's drafted age yet is already superior offensively.
Brogdon hasn't tapered off. The reason why he fetched relatively little is because his extensive injury history made his contract undesirable.