SA16
Sixstring
Most of the time it happens in football and that’s how I’ve gained my insight to these move up to the 1st, 2nd, 3rd picks of the draft deals. Either the team drafting just doesn’t like a guy at the top and their top ranked guy was at a lower range, or, more common the team trading up is in a spot that allows the team with that 1-3OA to still take their #1 target and then add additional assets.
Football is completely different because teams draft for need rather than BPA because the players all come in and play immediately and don’t have long careers