Lord Chaitanya: Mission of Lord Chaitanya

Q. We are taught to accept Guru as he represents the disciplic line. I've read and heard that guru always speaks without deviation from the previous Acharya in the line. I was wondering about the difference between Sri Madhvacharya and Sri Chaitanya Mahaprabhu. Specifically as it pertains to our line, and the question of authenticity.

Q. 1. I'm having difficulty understanding the divinity of Sri Caitanya Mahaprabhu.

Q. When I talk to someone about god I usually talk about Krishna. But when I say Mahaprabhu is also Krishna Himself, they get confused and then I tell them that Chaitanya Mahaprabhu is Krishna Himself. But the thing is I don't know how to answer them properly and I think I make them more confused.