I disagree with your summary on several points.
The Spurs squad that went into the 92 / 93 season, the first season of the Premier League, was not as bad as you suggest.
The side was in transition and finished 8th in the Premier League and reached the semi final of the F.A. Cup.
There was plenty to get hold of at this stage. The new signings; Teddy Sheringham, Neil Ruddock and Darren Anderton had all hit the ground running and the emergence of Sol Campbell and Nick Barmby from the youth team had turned everything around.
We lost the F.A. Cup semi to Woolwich and tbh we were robbed by some shit refereeing in that game.
They went on and won both the domestic cups; Sugar sacked Venables and Ruddock demanded a transfer.
This was the start of a pattern we became used to under Sugar and it continued under ENIC.
94/95 season was very similar.
Several great signings from the 94 World Cup, finished 7th in the league and again lost an F.A, Cup semi final to Everton; having beaten Liverpool, in the quarter final, at Anfield.
The decade of despair was from 95 - 05.
Spurs were still credible until 95. Woolwich were actually shite as well by 95 but then appoited Wenger and we went in opposite directions.
Campbell leaving for N5, in 01, being the low point.
Sugar did not understand football and didn't like football people in general in my opinion.
He was the wrong man for Spurs and ENIC are just Sugar's methods with a bit more luck and a slightly better idea about what they are doing.
Levy has had better luck and judgement regarding some of the people he has hired to administer the football operation at Spurs than Sugar did.
Sugar fucked up regarding the timing of sacking Terry Venables; appointed Ossie Ardiles at the wrong time and gave Gerry Francis too much money to spend. Gross was just a disaster without his English speaking right hand man. The media took him apart.
By the time Sugar appointed Geroge Graham he was getting desperate.
Levy didn't get it right until the Arnesen / Jol appointments.
The ten years in the wilderness changed THFC.
It's been jam tomorroiw ever since.