Great job completely ignoring what I said. You said he was a more opportunistic scorer. He rarely even considered shooting, that's not being an opportunistic scorer.
And no, Klay didn't score more because he played more. He just flat out scored more. Averaged 0.416 points per minute, Livingston averaged 0.248 points per minute. For Livingston to have matched the 15.8 Klay scored per game in the Finals, Livingston would have had to average 63.7 minutes a game. In fact, the 34 points Klay scored in game 2 in 46 minutes is four more points than Living scored in the entire Finals in 121 minutes. But Livingston was a more opportunistic scorer? LOLz.
And Klay shot over 50% in game two, 44% in game 4. Two is more than one.
But Klay provides nothing on defense? He finished 6th in the others receiving votes section for All-Defense and got three first-place votes, he received the third most votes for All-Defense for all GS players. Yes, he committed some dumb fouls, but to say he brought nothing in that facet of the game is patently ignorant. Shumpert shot 26% for the series (season average of 41%), JR Smith 31% for the series (42% season average). That didn't just happen by accident.
But yes, Livingston had more assists, and that's because he's the primary ball handler and point guard when he is in the game. Klay is rarely ever the primary ball handler nor is he ever a point guard, he's a pure scorer whose role on the team isn't to create assists. But once again, great job being clueless on the roles of the two players.
I notice that it's rather convenient that you chose to ignore stats that worked in Klay's favor. Like he averaged less turnovers per game, yet he played nearly double the minutes that Livingston did. Klay's turnover rate of just 1.01 turnovers per 48 minutes. That's even considerably low if his entire role was nothing but catch and shoot, much less one who is a high usage rate scorer.
And of course, you also ignore the fact that Klay stretches the defense because he is one of the best shooters in the league and he gets much more defensive attention than Livingston. You don't even really have to defend Livingston outside of the paint (other than the left short corner, as can be seen here
http://www.basketball-reference.com/players/l/livinsh01/shooting/2015/) and if he's is beating you with scoring it's because your defense has completely failed to defend the paint.
For the series, Klay had a +/- per minute of 0.153, Livingston 0.132. Extrapolate that out to per 38.0 minutes (what Klay averaged for the series), Klay was a +5.80 and Livingston +5.02.