Let's play out a short thought-experiment:
initial assumption: the team is committing to playing Lauri, Hendricks, and Keyonte
initial conclusion: there's a lack of playmaking in that trio, so the other two players need to have those chops.
Let me just jump to my point here: we need a big that can perform at a high-level in the short roll. The short roll in today's NBA is not primarily about scoring—though you do need to have that threat, and apply that pressure—it's more about how the player executes a quick read and passes out.
I don't trust Kessler to do this at a high-level right now. I'm sure he's working like hell on it. And so,... I see a path for Lofton here. I can imagine a Lauri-Hendricks-Lofton trio working on offense and defense. The defensive philosophy should borrow heavily from what Denver is doing with Jokic (Lofton is Jokic here); they bring him up to the level of the screen and do a lot of switching. Lauri and Hendricks are backline defenders that can protect the rim. The fit on offense is pretty obvious.
That leaves a need for additional playmaking guard. Keyonte can do plenty, but there needs to be another guy out there. I understand the desire to draft Castle, but I'm not a draft guy anymore (haven't been for years, tbh).