For the starters, need someone that can catch and shoot. With Rose being able to penetrate a defense regularly, vital they have floor spacing. Porzingis can do that, but we need a spot up natural shooter at 2.
Believe it or not Afflalo would not be that bad, now paired with someone that can be the primary shot creator. Last year we were relying too much on AA being Kobe like. With Rose, Afflalo can stick to being either a post up threat or a spot up shooter nothing else. However i did not like the chemistry and attitude AA showed last year. Came across as a selfish player.
Someone Allen Crabbe would work for me. Likely to get him you are going to need to spend 40$m on a 4 year deal in my estimation. However Crabbe really would fit in well. Good catch and shoot player, already knows how to run and get open for 3's and knows how to play off two ball dominant perimeter players. He is high on my wish list.