Rank ups in ORDER

So I have some 6 stars at rank 2s and 3s and wanted to rank up. Focusing BG, Act 8 completion and 7 exploration.
Who should I rank up and what should be the order of the rank up. Suggest at least TOP 5.

DUST, RED SKULL, OMEGA SENTINEL, AMERICA CHAVEZ, GALAN, SILK, TIGRA, BLACK CAT,
VALKYRIE, DANI MOONSTAR, MISTER SINISTER, LONGSHOT, CASSIE LANG, RINTRAH, GLADIATOR

Comments

AzKicker316

Dust
Skull
Chavez
Silk
Dani or Valk

Ben_15455

Chavez
Valk
Galan
Silk
Cassie

Yodabolt21

Chavez
Black Cat
Sinister
Galan
Tigra (if you are good with her)

Archit_1812

Cassie and Galan (I'm biased)
Chavez
Silk
Sinister
Black Cat (but only if you don't have Kingpin or AA at r6)
Gladiator
Moo Cow

Talhamaziz

@Archit_1812 why Cassie? Defense offense?

Archit_1812

@Talhamaziz offense really, but she's an absolute tank on defense as well.

Yuvraj_267

All are decent, rankup all of them but if i playing instead of you then my preference to 'who to rank up first' is
1. Mister sinister
2. Galan
3. Valkyrie
4. Silk
5. America
6. Red skull
7. Black cat
8. Longshot
9. Dust
10. Tigra
11. Gladiator
12. Rintrah
13. Omega sentinel
14. Dani moonstar
15. Cassie lang
Note: not known anything about cassie.
Well these positions are highly interchangeable.