I agree that Kulu is not the leader for Spurs needs, but if you compare players to the leadership qualities of Roy Keane, majority of players (even his team-mates at that time) would fall short. His leadership qualities were unique.You got to be joking, Kulusevski, the same medicore player who plays well for 6 weeks then disappears for months in end, the same player who loses the ball but does nothing to try retrieve it , the same clown who lost the ball at the edge of pools box today and jogged back like he hadn't a care in the world and they knocked in their fourth goal.
Leaders lead by example and he ain't setting it, see the likes of Roy Keane or Bryan Robson who would die for their teams and deal with those who would not, Kulu simply does not have these qualities and it's hard to see who has in this group.
But his style worked partly because Man Utd at that time had a manager in Sir Fergie who could control the psycho Roy Keane and Man Utd were a winning team. Ledley King and Harry Kane were also a leaders without being a mental cases.
Besides, in today's football, with VAR, Roy Keane could have been sent off every other game