If you say Lampard, Zidane, Luis Enrique, Guardiola etc, there is a massive difference- they were all leaders for their club during its heyday. They inspired their sides to glory- be it Zidane in the Champions League Final and 2 different World Cups. Pep was captain of Cruyff's dream team as a player, Luis Enrique was also Barcelona captain once upon a time. Lampard is Chelsea's greatest ever goalscorer and was captain on that night in Munich.
The closest comparison to Ole in terms of club legends who were appointed is Filippo Inzaghi, but even he is closer to a T2 Club Legend than he is to Ole(Tier3 for me- Giggs, Sir Bobby Charlton, Best, Law and Scholes are t1. Beckham, Edwin, Schmeichel, Keane, Neville, Irwin, Rio, Vidic, Evra are t2, Ole is t3.)
Ole has had more time than Moyes, yet the latter had a better winning record with a weaker squad. There are no more excuses, only nostalgia.