KAT could be a really good fit alongside barnes and is also 2 years younger than siakam.
Siakam could also be an amazing fit next to edwards and gobert and may be the final piece they need to make them legit contenders.
You can also then trade poelt for some bench pieces like cason wallace + salary filler and picks.
Siakam is the best number 2 option in the league. Elite defender, can facilitate and score at a high level as a number 2. Score first guard/wing have always been a great combo with a point forward type of player like pascal. For example, mj/pippen, lbj/kyrie, draymond/klay and steph, pascal/kawhi have all been great duo’s with their style of play fitting together seamlessly. Siakam and edwards would be a great fit.
Also, pascal is a much better defender than KAT and can elevate the ceiling of an already great defense.