It's sounding like Markus didn't completely share his plans and aspirations for the club with his immediate family - the very same members now wanting to deviate from the course that Markus and Cortese supposedly set. Of course, if Markus didn't commit any of these aspirations to paper then the Liebherr's might only have Cortese's word to go on re: Markus's wishes for the club.
Maybe its a simple case of the Liebherr's not believing what Cortese is telling them re: Markus's aspirations or that Cortese could be embellishing them to accelerate the project beyond what Markus envisioned?