I don't think he will walk though Alves, PJ. If it's a standup fight (mostly) I think Alves wins.
Hughes took him down but couldn't keep him down. GSP is better at both (take downs and holding people down). I think he'll take Alves right down, but Alves might be able to stand back up and start to hurt GSP standing.
If GSP can't hurt him on top, I think he loses. I never thought Fitch had much of a chance and Alves is much more of a challenge - bigger, better standing, better takedown defense, better at getting up
I think GSP would beat Anderson btw - I wouldn't compare his shot to Henderson's upper body takedowns.