I knew a young lad that wasa youth team player at Pompey when Redknapp was there. He said Redknapps training was poor, it centred around playing hour after hour of five a side. To be fair to Redknapp, by his own admission in the past he's admitted that it's all about good players. What he is good at is buy players and getting them to play in a good system and also attractive football, so not fair to say he doesnt have a clue. End of the day he took Pompey up as champions, to their highest league position since the war and won the FA Cup and brought champions league football to Spurs.
What he isnt good at it seems is improving players, motivating and managing underperforming players or bringing through young players. He does have a clue, but he only has a clue if he can do things his way and that seems to be short term thinking and the club to have deep pockets. He isnt any good at getting the best out of what he's got, which is why he wasn't the right man for England.