Haven't seen Eng play T20s as bad as these last two games lately. Could the absence of Morgan as captain be the reason? No matter how important captain is, almost everyone believes you can't have a captain who isn't scoring so Morgan had to go. But is captaincy so important to makeup of the team that it can overcome even personal lack of form to win games just by strategy and other things.
Consider India in tests, after coach Ravi Sastry left, under coach Dravid, Ind lost the test series against a non-full strength/weak SA team. Same result in the one off Eng test, of course Eng were propped up by Baz-Stokes in this department to make it even more one sided. Pant and KL as captains were quite underwhelming to say the least. Right now, in Ind team, with so much rotation, the senior most players available are getting the captaincy/vc duties when regulars are not available. It seems to me there is no thinking at all among the selectors as to who will be a good captain at all, they just go by seniority which seems quite naive. Otherwise how can one explain Jadeja as VC when he was such a flop in IPL and he himself said captaincy was affecting his game in all 3 departments and relinquished it.
I think this is a question that will need further debate. Not just captain but coach and captain setup is very important I feel, and I am not sure teams all over the world give enough thought to this despite the amount of damage it can do when the right person isn't in the captaincy/coaching job. Selecting a player with great playing record for coaching job isn't the solution for sure. Langer and Dravid failures vs Sastry, Mccullum , Dave Whatmore, Bob Wooolmer (not best players but ones with great coaching skills/attitude) successes.