He might be a genius, I don't know, I don't think he has done enough to be quantified as a footballing genius yet.
Fergie was a genius, master of mind games and motivation, won the title with some average Man Utd sides etc.
Mourinho was a genius for winning the CL with Porto and to a lesser extent, with Inter.
The problem with Pep is that he's always had great sides to back him up. A true managerial genius is someone who can do it without also having the best team in the competition. He might do that in the future, though.
Tbh I feel uncomfortable using the word "genius" with football in general though, it's a sport, not Mathematics or Rocket Science!