They would definitely be up there. It's really hard to do P4P lists because usually they are dominated by smaller fighters but there isn't really a drop off in skill between HW's and Max fighters.
Now as far as #1 I would put Tyrone Spong up there based on skill. He doesn't have the resume like the others because he started out at 145 lbs and is bulking up to fight the HW's. But when it comes to his skill set I think he is pretty complete as a fighter.
Like Remy, very good defensively, great leg kicks, but his boxing is his biggest weakness.
Hari is powerful, good kicks, good boxing, but his defense is a little suspect as is his chin but he does have fantastic recovery ability.
Then you have Max fighters who are all really good and definitely would grab some spots on the list. But right now I think that Spong is complete, now he just needs to win big fights to solidify this, which he has started by defeating Kaoklai, Diender, Vielvoye, Staring and Mes, Samedov and he has a fight with Saki early next year.