Harris cannot guard Leonard, period. In my opinion Gordon is a superior defender than Harris, and Kawhi scored at will even when we put 2 defenders on him most of the time. (27.8ppg, 7rpg, 55.6% in the series) Kawhi will destroy anybody Philly puts on him.
Gasol is a great defender with a lot more playoff experiences than Embiid. Another issue with Philly is that Simmon is not a threat outside the arc while all Raptors starters can shoot 3. As long as Raptors do not turn the ball over Simmons will be useless on offense.
The team with the best player on the court usually win the series, and Raptors has the best player in this series.
Raptors in six.