MHD, I'm not sure which position you're referring to - the SF or PF spot. I think Carr's highest value is as an offensive Big, and I don't see why you would ever put him at SF with the options UK has at that position. On the other hand, I think Noah is either a 2G or SF (my guess is this will be his best spot). Noah was a pretty good rebounder in high school, but I'd question him playing PF in Div. I.
But I agree with you that the value of the 3pt. shot dictates that you really want both the SF and PF to be able to hit that shot at a decent consistent clip.