I think McEnroe had respect for Ashe as a player, but not so much as Davis Cup captain. Mac felt he wasn't a great leader, and wasn't strong enough to keep a tight rein on Connors, who pretty much flipped in the final against Sweden.
Yes, the 1984 Davis Cup final where Sweden gave the USA a battering on clay. Wilander thrashed Connors in the first rubber. Then McEnroe, in his golden year, lost to Sundstrom in straight sets, and then in the doubles rubber, McEnroe/Fleming lost a Davis Cup doubles match for the only time in their career as a doubles team, losing to Edberg/Jarryd. McEnroe and Ashe had some sort of fallout, as did Connors and Ashe (although that was nothing new). Ashe and McEnroe seemed to have a lot of respect before this tie, as far as I can see. Not sure about afterwards, though.
1984 was the only year that Connors played in the Davis Cup on a full-time basis. Connors played in just 7 Davis Cup ties during his career, and 4 of them were in 1984. As for the other three, two of them were in 1975 when Tony Trabert was captain, and the other was in 1981 when Ashe briefly convinced Connors to give it a go.
As for McEnroe's belief that Ashe wasn't a strong enough leader to keep a tight rein on Connors, I'd ask "Who is?", apart from Connors' mother and grandmother? Connors was a lone ranger, that's just the way he was. He tried to be a team player a few times, but it didn't really work in Davis Cup. Connors did play a big part in the USA's 1985 World Team Cup triumph, though, when Mecir was crippled with nerves.
Not sure how Mac viewed him after his diagnosis. But I do recall Connors saying a few nice things about Ashe when he died. But these things always happen when someone passes on, don't they?
The relationship between Ashe and Connors was a lot more complex, ranging from mutual loathing (including multi-million dollar lawsuits) to respect and all sorts in between. Ashe once said that it took all his willpower not to punch Connors in the mouth whenever he saw him in the locker room. I love another famous quote from Ashe:
Reporter: Isn't Connors an a***ole, though?
Ashe: Yeah, but he's my favourite a***ole.
Before that 1984 Davis Cup final, Connors was mistakenly locked out of a training session where McEnroe and Fleming were training, and once Connors eventually gained access, he wrote in the clay in large letters "F*** you, Artie" before leaving in prompt fashion.
On the more positive side, I've seen Connors and Ashe laughing and joking when Ashe interviewed Connors at Wimbledon after many of his matches, and they seemed very friendly on those occasions. It was a very interesting relationship they had.
Could you elaborate on that?
A nick here, a cut there, and pretty soon, you're bleeding.
Was that the theory that Mac just cut you here and then there and then nicked you somewhere else, and just kept up a cumulative and inevitable slow blood letting?
Correct. Death by a thousand cuts.