depends how Jones views he covers the back row in the squad 
6 positions 
You need at least 2 per position or who can cover so you Neally need a specialist in each position and cover who can play multiple spots - like a 6.5
6. Currently Holloway and leota providing leota can get fitness back 
Here Samu and valetini who will be locks for spots can cover 6! 
Along with Wilson, Wright who is like a 6.5, swinton 
7. Hooper will de definite so do they pick another specialist 7 like mcreight or use Samu or gamble who can cover the whole back row 
Wilken is in the same boat here 
8. Valetini and Samu are locks in back row 6 positions so they may take the 8 unless there is one less 6 or 6 in which Wilson or Gamble take the spot?
What you need in a World Cup is specialist, guys that can cover the back row and good depth with guys fighting for spots which we do which is a great thing 
Potential backrow 
Holloway - who could he used as a 4th lock to get another in the squad? 
Leota 
Hooper 
Mcreight 
Valetini 
Samu - lock (covers all positions) 
this leaves reserves - who are in contention and could 
Wright 
Wilson 
Uru
Swinton 
Gamble 
Gleeson 
Wilken 
look at NZ 
Not many specialists but plenty who cover multiple positions 
They have plenty of backrowers who can cover all positions but still trying to find the right combo 
6 - Blackadder (lock), Ioane, frizell, Jacobson 
7. Cane, Savea, papali’i, jacobson
8. Savea (lock) sotutu, jacobson, grace 
potential back row
6. Blackadder 
7. Cane / papaali
8. Savea 
20. Papaali 
+ frizell and sotutu which leaves 
Ioane, Jacobson, grace and res 
what’s the perfect mix, specialist players or like we see alot today guys that cover multiple positions?