Gas DF versus Snow DF : Which one who preferred to be the next DF user for Strawhat Pirates

Let us discuss on the next DF User for Strawhat Pirates..
Correct me if I'm wrong in providing you guys the information..
Strawhat Pirates got ONE Zoan DF User which is Chopper..
Strawhat Pirates got three Paramecia DF User which are Luffy, Robin & Brook..
So could it be the time for Strawhat Pirates to get Logia DF User/s as Nakama..?
The best TWO Logia DF User that every theorist out there always brought to our attention are Snow DF & Gas DF..
What do you guys think of this..?

We already met the character that hold this great Logia's DF:
i) Monet
ii) Ceaser Clown a.k.a Gangster Gastino

So the theory goes like this..
i) Snow DF
If Monet still alive..
Could we see her as female Nakama for Strawhat Pirates..?
Maybe she's useful for the next arc (If the moon arc is set to be in future..)
But if she's dead..
And the phenomenon of Snow Rabbit appears near Thousand Sunny..
Maybe one of Nami's tangerine is turning into DF..
And the probability of someone eating it in the near future is high..
If female character eat this Snow DF..
Maybe she will need changes too (As Law changed Monet into Harpy)..
This will make the Snow DF User become more powerful and adapt with the changes..

Please read about these post, click the link:
a) Carrot vs Vivi
http://whenzicotalks.blogspot.my/2017/03/next-female-nakama-carrot-versus-vivi.html

b) Vivi as next female nakama
http://whenzicotalks.blogspot.my/2017/03/one-piece-nefertari-vivi.html

c) The List of Alphabet for Nakama
http://whenzicotalks.blogspot.my/2017/03/one-piece-list-of-alphabet-for-nakama.html

ii) Gas DF
Ceaser change his name as he entered Firetank Pirates..
I think he will betray Capone in near future..
Because Capone forcing Ceaser to become his subordinate..
Capone make used of Ceaser's heart..
Gas DF was useful for every purposes..
Gastino can help Chopper with medicine..
Help Usopp with weapon invention..
Help Franky with shipwright..
And help Sanji with cooking too..
Gastino a.k.a Ceaser would also reach his dream by overcome Vegapunk in future..

What do you guys think of this..?
Please share some thought with me.. ^^