At the end of the day, I really don't think the Lakers did anything wrong in any of this, from their end. They didn't have any leaks (That whole conversation that Magic had with Kawhi on his own time couldn't have been leaked by the team, since he is no longer part of the organization). It's just a matter of the Clippers doing everything they needed to do, including trading 5 1st round picks, to get the 2nd star next to Kawhi.
People will surely want to blame Pelinka for this, but what else could he have done? They already traded for their 2nd superstar 3 weeks ago.
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Here is the issue with Butler. He wanted the 5 year max deal, something the Lakers could not have done unless they did a sign and trade. They obviously couldn't do that. As far as Walker as concerned, maybe.