A shaikh says that Jihad is only defensive.

Answer

The bootlicking 'shaikh' should renew his Imaan. It is a grievous error to believe that all Jihaad is defensive. What kind of 'defensive' jihad was it for the Khalifah in Madina to send armies to fight the Romans and Persians. The objective of Jihaad is I'laa Kalimatullah. Almost all the Jihaad campaigns of the Sahaabah were offensive.

Yes, minus Islaah, there will be no victory. Thus, Islaah is Waajib. Jihaad will always remain a Waajib obligation just as Salaat will always remain Fardh even if the Ummah abandons it. The shaikh is in error.