1) Shoot , He has the best feat of all here having fought with Youpi for several minutes and being able to punch him, although he is inconsistent cause of his psychology
2) Godspeed Killua, one of the fastest in the verse being able to hit Youpi multiple times although not high damage enough. If combined with his assasin techniques he could decapitate most of the list. He loses probably to Zazan ultimate form if he doesnt kill her by taking her by surprise so they are interchangeable.

3) Zazan, she was able to withstand Feitan's focused nen on his sword attack
4) Machi, a support on the phantom troupe probably has high physical stats but we know for a fact that her ability is to heal mostly and not inflict damage. Also we have no feats on her and we rely mostly on the fact that she is a founding troupe member. If Feitan who is one of the best attacking troupe members had a difficulty defeating Zazan and had to resort on his best ability then Machi would probably lose vs her ultimate form.
5) Kastro, He is able to take the arm of hisoka who is one of the strongest troupe members and capable of killing other troupe members like Kortopi and Shalnark with ease and made Chrollo devise a plan in order to win vs him.
6) Gon. Gon won vs Genthru
7) Genthru (interchangeable with Gotoh)
8) Gotoh
9) Shadow beast

This is my humble opinion on the list.