I think WCS fits with Cousins but if you heard the Lowe Post podcast with Ford he says many FO's feel he will have to get his ankle fixed sometime in the next year, but its not a long term nagging injury concern. Also says he gives you nothing offensively, but I have as much faith in Ford evaluating talent as I do 99% of twitter reporters out there. It does seem you should trade down though and try and pick up another veteran piece along with WCS, while maybe dumping one of the young SG's or Landry's contract.
I have been a fan of Mario, but if Cousins and Gay are staying there is just no room for another volume scorer, and he is most definitely a JR Smith, Marcus Thornton microwave volume guy, even if his ceiling is higher.
I personally think its down to Justise and WCS if Cousins is part of the future. Mudiay, Porzingis, Hezonja if they plan to blow it up.