I too have watched a lot of this Windies series and they are on the way back as a serious team. Jason Holder is a wonderful all-round cricketer who is still improving as a batsman and bowler, is an excellent slipper and clearly the leader they need. He's got his senior world class men Kemar Roach and Darren Bravo back (Roach is the best bowler in the world to left-handers, bar maybe Ashwin). They have a toughness to them, this new mob. Bravo made the 3rd-slowest 50 in Test cricket (340 minutes, 215 balls) and it was exactly what his team needed, and he needed, after two years away from Test cricket.
Brathwaite is the antithesis of the attacking opener with flair we have seen from the Caribbean. He doesn't have many shots but he sells his wicket dearly. Jon Campbell provides the attack at the top of the order; I think they will form a good partnership.
A name Richmond fans can't help but love, Shai Hope, is their next potential world-class batsman. It's a tough job for a young man to hold down number 3 - Ponting wasn't doing it at his age - and he's only averaging 28 after 28 Tests, but he averages 49 away from Tests and you can see his talent. Likewise Hetmyer at number 6. Chase is a solid player who contributes with bat and ball and the keeper Dowrich is a good little player. Shannon Gabriel is fast and mean and bowls a heavy ball and Alzarri Joseph is a very promising fast bowler.
England are ripe for the picking. They have no openers and are batting a keeper at 3. Bairstow has talent but is too loose, as evidenced by more than one dismissal this series bowled through the gate aiming a big drive. They bat another keeper, Buttler, at 5. Sam Curran might one day be a good all-rounder but playing him ahead of Broad in the first Test smacked of complacency. At this stage he is nonthreatening as a bowler and talented but immature with the bat (and batting at 9!).
England might win the World Cup. They go hard from ball one and keep going to over 50, so they can make 481 or whatever it was. But they don't have the patience, discipline and techniques to make big scores in Test cricket against quality bowling. If we stay humble and disciplined and pick the right side, we can beat them. Anderson and Broad are still our biggest obstacles to regaining The Ashes.