Agreed--it's just opinion on both sides, and honestly, either one of us can realistically and reasonably argue how the facts at hand support his position.
As for Kerr and Curry--Kerr's first year there was 2014-15, and Curry's stats actually didn't take a huge jump that first year. It was his second year (when Walton subbed in for the first 1/3 of the year) that Curry had his amazing offensive season.
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Really, looking at the change in GSW's performance from under Jackson to Kerr, the biggest change appears to be in assists. They were averaging ~23/game, and jumped that up to 28, 29, then 30+. To me, that's primarily attributable to Kerr's system.