Diminishing KA's value because he's a hesitant shooter is dumb af. What about Boris? I know they're not the same type of player but he had that same hesitant mentality (despite being a much better shooter than Fathead) and he was still a valuable cog. I don't think him developing a decent corner 3 and a decent midrange game is out of the realms of possibility either. I actually kind of expect it to happen.
Another thing, why are people being so short sighted with "roster fit"? He's 24 and his offer sheet is for 4 years. The roster was constructed with the assumption that there is a Top 3 player at SF. Obviously if Kawhitter gets his way that will no longer be the case and PATFO will build the roster to better fit the new core. The only reasonable argument I've heard for not matching is the fact that the Spurs would get a SF or two in exchange for Kawhitter, but KA can easily play the 4 in today's NBA.
Murray
Green
SF from Kawhi trade
Fathead
Aldridge
Gay, Manu, Mills, White, Gasol, player from Kawhi trade
That's a Top 5 team in Year 1 post-Kawhitter with room for improvement in following years, tbh.