The Raptors didn't have anyone to matchup with Lebron -- Siakim just wasn't very good on him. OG was alright, but he is still figuring it out. The Cs have Morris, Ojeleye, Brown, and Horford to defend Lebron.
Also, when the Raptors went small to spread the floor and hit more 3s, they didn't have anyone to guard Love.
The Cs will hopefully stay home on shooters and make Lebron and Love create in isos. The Cs can't shut Lebron down, but I do think Love might have some trouble scoring consistently in isos.
If the Cs show up defensively, they'll be in every game.
On the other side of the ball, who is going to defend Rozier? Hill? Clarkson? Smith?
Who is going to defend Brown and Tatum? Hood? Smith? James? Green? Osman?
I actually think the Cs are set up to get good shots on offense and make the Cavs take tough shots on defense. That's a good recipe for success.