Do we have Bird Rights to KO and Jerebko? Or just KO?
I believe so. You need to have a player for two full seasons and at least part of a 3rd in order to have full Bird Rights. Since we traded for him midway through the 14-15 season, we meet that threshold (early Bird Rights come after one full season and at least part of a 2nd).
So it really comes down to who is your cup of tea - KO or JJ. Without a max FA, we can easily sign both and still sign a very good FA. We could even use the room exception (if we go over the cap) to sign Amir - how much of a market will there really be for him anyway? This might be the option of we do sign somebody like Hayward since we could no longer afford KO's and JJ's QOs.