Crawford is a great champion, among the top 10 p4p five or six years, the best LWW in the last decade, surely. I hope he will face Spence (or Pacquiao, at least) this year, so we will know if he is the best WW.
But, there is a reason the weight divisions exist in the boxing. GGG with his power would be too much for him, Let me remind you of Kell Brook and his fight against Golovkin. BTW, I don't want to compare Brook and Crawford.
So, I want to see Crawford against Spence (or Pac, or Taylor/Ramirez winner), and Golovkin should retire soon (no more than 2 fights against the natural MWs).