WI don't have much in the squad, but after Gayle's comments, you can sense this is probably the format they care about...
Gayle
Marshall
Sarwan
Chanderpaul
Bravo
Pollard
Ramdin
Sammy
Taylor
Benn
Edwards
Plenty of batting depth (till 9/10), 5 seamers, and 2 spinners. Maybe Sammy can be dropped to include Simmons, but as mentioned above, he doesn't seem like a limited-overs player. Marshall will be there to provide explosive starts, more or less, and Sarwan and Shiv will need to score a lot of runs. Bravo too, he might open after his stint at Mumbai Indians.
Bowling relies on Edwards, Bravo and Taylor/Benn providing good support. Sammy and Gayle need to be economical.
But...yea, not looking very strong this side. Too many weak spots. Not many explosive batsmen in the top 7, Marshall, Pollard, Ramdin are inconsistent, Sammy is decent but not someone they can constantly rely on getting runs and taking wickets, Taylor seems to have become and even worse batsman after his 100, if that's possible, and Edwards apart, the bowling lack fire. Taylor on his day is great, Bravo is canny, and Benn is a nice spinner...but not very dangerous overall. Tough group too.