Keegan only had a 28% win record from 21 games (the worst of his managerial career), and after being out of the game for so long i think he would of done ok at best.
Bold:
Ok lets look at this logically. These were the teams KK lost too in his second spell.
Keegan's side played Arsenal 3 times
Man Utd (Played them twice though. Only lost once)
Aston Villa
Blackburn
Chelsea
Everton
Liverpool
To lose to those teams isn't exactly terrible. He had to reverse the awful midset and morale FSA had created in his spell at the club. We all know how poor he was at the club. Think back to Liverpool at home when we should have lost by 7 or 8? And when you compare how easy his first 19 games in charge were its quite laughable.
Keegan hardly had the easiest spell to manage in and the masterstroke of the 433 kept us up that season. There is no doubt in my mind.