I'm not sure if Bentley had an Indian Summer at Blackburn or not, but he's certainly a cut about Pennant mate.
I've no idea why he isn't getting a shot at Spurs, but it's clear Redknapp doesn't rate him or dislikes his attitude, and he's got Lennon, who's much improved, ahead of him in the pecking order.
He cost Spurs £16-17M for good reason and players don't go shit overnight. That said, Spurs are always minted so I doubt there's a bargain to be had.